Before I detail the problem, let me mention I have been able to reproduce this problem on two entirely different computers running WinXP Sp2, so it seems highly likely the open-source program MediaCoder is at fault (sourceforge.net). I have posted this to their bug tracker forum but have not received a response for about a week, so I'm hoping someone here can give me some insight and help me figure out what's going on (because maybe I'm wrong--maybe it's another issue).

If I have Firefox open, when I first run Mediacoder (after just installing it), and I go to "Options" and click "System Information", the program is supposed to pull up a window in my default browser (firefox) and display info about my system. Instead, Firefox asks me if I want to uninstall my McAfee SiteAdvisor add-on; even though I try to exit this, SiteAdvisor still gets uninstalled in firefox. And worse, when I reinstall Siteadvisor, it only stays around as long as I have Firefox open for that session; if I close firefox and then reopen firefox, siteadvisor has completely disappeared again. I can repeat this endlessly--Siteadvisor no longer stays permanently installed.

Also, I can no longer run Azureus--it crashes on startup, and uninstalling/reinstalling with latest version doesn't change anything. Before I ran MediaCoder and used the "system info" menu item, Azureus was working fine.

As a precautionary measure I have run AVG anti-virus, AVG anti-spyware, Ad-aware, Spybot Search & Destroy, SuperAntiSpyware, and none of them have turned up anything of significance (e.g. a few tracking cookies, etc.). I don't normally like to use "registry cleaners", but I gave Glarysoft Registry Repair a try to see if it could help me (of course I backed up my registry before using it)--still did not help.

Can anyone please help? Here is my HijackThis log in case it helps:
===========================================

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 6:59:19 AM, on 2/7/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16574)
Boot mode: Normal

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Ad-Aware 2007\aawservice.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
C:\WINDOWS\system32\pctspk.exe
C:\WINDOWS\System32\tcpsvcs.exe
C:\Program Files\SiteAdvisor\6253\SAService.exe
C:\WINDOWS\System32\snmp.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Viewpoint\Common\ViewpointService.exe
C:\WINDOWS\system32\fxssvc.exe
C:\Program Files\SiteAdvisor\6253\SiteAdv.exe
C:\PROGRA~1\Grisoft\AVG7\avgcc.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe
C:\Program Files\PicBlock\picblock.exe
C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\FreeRAM XP Pro\FreeRAM XP Pro.exe
C:\Program Files\Microsoft Office\Office\FINDFAST.EXE
C:\Program Files\TRENDnet\TEW-421PC_TEW-423PI\TRENDnet.exe
C:\Program Files\Last.fm\LastFMHelper.exe
C:\Program Files\Viewpoint\Viewpoint Manager\ViewMgr.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Documents and Settings\Our Guest\My Documents\DOWNLOAD\HiJackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.earthcaller.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://www.hotmail.msn.com/cgi-bin/sbox?action=inbox
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = http=127.0.0.1:8080
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!

\Companion\Installs\cpn0\yt.dll
O2 - BHO: btorbit.com - {000123B4-9B42-4900-B3F7-F4B073EFC214} - C:\Program Files\Orbitdownloader\orbitcth.dll
O2 - BHO: Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn0

\yt.dll
O2 - BHO: MXPLAY - {0444D43C-3E29-40DC-916B-E5680566AE38} - C:\Program Files\MXPLAY Web\mxtension.dll
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common

Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {089FD14D-132B-48FC-8861-0048AE113215} - C:\Program Files\SiteAdvisor\6253\SiteAdv.dll
O2 - BHO: StumbleUpon Launcher - {145B29F4-A56B-4b90-BBAC-45784EBEBBB7} - C:\Program

Files\StumbleUpon\StumbleUponIEBar.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Yahoo! IE Services Button - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O2 - BHO: Viewpoint Toolbar BHO - {A7327C09-B521-4EDB-8509-7D2660C9EC98} - C:\Program Files\Viewpoint\Viewpoint

Toolbar\3.8.0\ViewBarBHO.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar3.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program

Files\Google\GoogleToolbarNotifier\2.0.301.7164\swg.dll
O2 - BHO: Piolet Toolbar Helper - {EDDF3383-EC5F-49DF-A8B6-CEC2D8F6164C} - C:\Program Files\Piolet Toolbar\v3.2.0.0

\Piolet_Toolbar.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn0\yt.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar3.dll
O3 - Toolbar: McAfee SiteAdvisor - {0BF43445-2F28-4351-9252-17FE6E806AA0} - C:\Program Files\SiteAdvisor\6253\SiteAdv.dll
O3 - Toolbar: Viewpoint Toolbar - {F8AD5AA5-D966-4667-9DAF-2561D68B2012} - C:\Program Files\Common Files\Viewpoint\Toolbar

Runtime\3.8.0\IEViewBar.dll
O3 - Toolbar: StumbleUpon Toolbar - {5093EB4C-3E93-40AB-9266-B607BA87BDC8} - C:\Program

Files\StumbleUpon\StumbleUponIEBar.dll
O3 - Toolbar: Piolet Toolbar - {C75C8E7E-5059-4469-AC11-D7544B260382} - C:\Program Files\Piolet Toolbar\v3.2.0.0\Piolet_Toolbar.dll
O4 - HKLM\..\Run: [SiteAdvisor] C:\Program Files\SiteAdvisor\6253\SiteAdv.exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe
O4 - HKLM\..\Run: [PicBlock] C:\Program Files\PicBlock\picblock.exe
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKUS\S-1-5-19\..\Run: [AVG7_Run] C:\PROGRA~1\Grisoft\AVG7\avgw.exe /RUNONCE (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-20\..\Run: [AVG7_Run] C:\PROGRA~1\Grisoft\AVG7\avgw.exe /RUNONCE (User 'NETWORK SERVICE')
O4 - HKUS\S-1-5-18\..\Run: [AVG7_Run] C:\PROGRA~1\Grisoft\AVG7\avgw.exe /RUNONCE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [AVG7_Run] C:\PROGRA~1\Grisoft\AVG7\avgw.exe /RUNONCE (User 'Default user')
O4 - Startup: Last.fm Helper.lnk = C:\Program Files\Last.fm\LastFMHelper.exe
O4 - Global Startup: FreeRAM XP Pro.lnk = C:\Program Files\FreeRAM XP Pro\FreeRAM XP Pro.exe
O4 - Global Startup: Microsoft Find Fast.lnk = C:\Program Files\Microsoft Office\Office\FINDFAST.EXE
O4 - Global Startup: Secunia PSI (RC1).lnk = C:\Program Files\Secunia\PSI (RC1)\psi.exe
O4 - Global Startup: Wireless Configuration Utility HW.51.lnk = ?
O8 - Extra context menu item: &Download by Orbit - res://C:\Program Files\Orbitdownloader\orbitmxt.dll/201
O8 - Extra context menu item: &Grab video by Orbit - res://C:\Program Files\Orbitdownloader\orbitmxt.dll/204
O8 - Extra context menu item: &Yahoo! Search - file:///C:\Program Files\Yahoo!\Common/ycsrch.htm
O8 - Extra context menu item: Do&wnload selected by Orbit - res://C:\Program Files\Orbitdownloader\orbitmxt.dll/203
O8 - Extra context menu item: Down&load all by Orbit - res://C:\Program Files\Orbitdownloader\orbitmxt.dll/202
O8 - Extra context menu item: StumbleUpon PhotoBlog It! - res://StumbleUponIEBar.dll/blogimage
O8 - Extra context menu item: View EXIF - C:\Program Files\ViewEXIF\EXIF.htm
O8 - Extra context menu item: Yahoo! &Dictionary - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O8 - Extra context menu item: Yahoo! &Maps - file:///C:\Program Files\Yahoo!\Common/ycmap.htm
O8 - Extra context menu item: Yahoo! &SMS - file:///C:\Program Files\Yahoo!\Common/ycsms.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03

\bin\ssv.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O10 - Unknown file in Winsock LSP: icaproxy.dll
O15 - Trusted Zone: http://musicstore.connect.com
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) -

http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (YInstStarter Class) - C:\Program Files\Yahoo!\Common\yinsthelper.dll
O16 - DPF: {341FF14B-00CB-49F5-A427-A164DF1D5E1F} (MALPlaybackCtrl Class) -

http://musicstore.connect.com/XSL/mb_us/ht...ALStreaming.cab
O16 - DPF: {3D3BF1F8-9696-4A5E-B4F1-49101C997B70} (VaxSIPUserAgentCAB Control) -

http://www.earthcaller.com/VaxSIPUserAgentCAB.cab
O16 - DPF: {712362BF-E411-4F43-99D2-EB15F80AF1DB} (MsneDiag Class) - http://entimg.msn.com/client/msnediag4507.cab
O16 - DPF: {94B82441-A413-4E43-8422-D49930E69764} (TLIEFlashObj Class) -

https://rtc3.webresponse.one.microsoft.com/...p/TLIEFlash.CAB
O16 - DPF: {A93D84FD-641F-43AE-B963-E6FA84BE7FE7} (LinkSys Content Update) -

http://www.linksysfix.com/netcheck/67/install/gtdownls.cab
O16 - DPF: {CC05BC12-2AA2-4AC7-AC81-0E40F83B1ADF} (Live365Player Class) - http://www.live365.com/players/play365.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) -

http://fpdownload2.macromedia.com/get/shoc...ash/swflash.cab
O16 - DPF: {DBA230D1-8467-4e69-987E-5FAE815A3B45} -
O16 - DPF: {FA945BB6-9D37-43FC-9B2A-AF09F56CBBF0} (moDiagCollectionActiveX Object) -

http://yme.music.yahoo.com/qos/cabs/DiagCo...tionControl.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{EB1F473A-40C9-488B-A541-12289BCF74EF}: NameServer = 192.168.0.1
O20 - AppInit_DLLs: C:\WINDOWS\system32\wmfhotfix.dll
O20 - Winlogon Notify: !SASWinLogon - C:\Program Files\SUPERAntiSpyware\SASWINLO.dll
O23 - Service: Ad-Aware 2007 Service (aawservice) - Lavasoft - C:\Program Files\Ad-Aware 2007\aawservice.exe
O23 - Service: Apple Mobile Device - Apple, Inc. - C:\Program Files\Common Files\Apple\Mobile Device

Support\bin\AppleMobileDeviceService.exe
O23 - Service: Ares Chatroom server (AresChatServer) - Ares Development Group - C:\Program Files\Ares\chatServer.exe
O23 - Service: Automatic LiveUpdate Scheduler - Unknown owner - C:\Program Files\Symantec\LiveUpdate\ALUSchedulerSvc.exe (file

missing)
O23 - Service: AVG Anti-Spyware Guard - GRISOFT s.r.o. - C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google

Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common

Files\InstallShield\Driver\1150\Intel 32\IDriverT.exe
O23 - Service: iPod Service - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: MSCSPTISRV - Sony Corporation - C:\Program Files\Common Files\Sony Shared\AVLib\MSCSPTISRV.exe
O23 - Service: PACSPTISVR - Unknown owner - C:\Program Files\Common Files\Sony Shared\AVLib\PACSPTISVR.exe
O23 - Service: PCTEL Speaker Phone (Pctspk) - PCtel, Inc. - C:\WINDOWS\system32\pctspk.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: Remote Packet Capture Protocol v.0 (experimental) (rpcapd) - CACE Technologies - C:\Program

Files\WinPcap\rpcapd.exe
O23 - Service: SiteAdvisor Service - Unknown owner - C:\Program Files\SiteAdvisor\6253\SAService.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\Program Files\Common Files\Sony Shared\AVLib\SPTISRV.exe
O23 - Service: Viewpoint Manager Service - Viewpoint Corporation - C:\Program Files\Viewpoint\Common\ViewpointService.exe

--
End of file - 13073 bytes

===========================