I have just gotten home from work, and ran an application I downloaded yesterday called "Advanced SystemCare". It seems like a fine app, whether it can fix this problem or not. Anyway, it generated a "HiJack Log" which I can post here, before I go on with the steps you suggested. Here it goes:
Logfile of Advanced SystemCare 3 Security Analyzer
Scan saved at 23:16:54, on 29.12.2010
Platform: Windows Vista (WinNT 6.0)
MSIE: Internet Explorer v7.0 (7.0.6001.18000)
Boot mode: Normal
Running processes:
C:\Windows\system32\taskeng.exe
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Windows\system32\taskeng.exe
D:\Sindre\Prog\Advanced SystemCare 3\AWC.exe
D:\Sindre\Prog\Game Booster\GameBox.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\Windows\RtHDVCpl.exe
C:\Windows\ehome\ehtray.exe
C:\Program Files\Mobile Stream\EasyTether\easytthr.exe
C:\Program Files\NVIDIA Corporation\nTune\nTuneCmd.exe
C:\Windows\ehome\ehmsas.exe
C:\Program Files\Windows Media Player\wmpnscfg.exe
D:\Sindre\Prog\Firefox\firefox.exe
C:\Windows\system32\wuauclt.exe
C:\Windows\system32\SearchFilterHost.exe
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Skype add-on (mastermind) - {22BF413B-C6D2-4d91-82A9-A0F997BA588C} - C:\Program Files\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O2 - BHO: Skype add-on (mastermind) - {42A7CE31-CEE7-4CCE-A060-A44A7E52E062} - D:\Sindre\Spill\DARKAG~1\KEYBOA~1\kie.dll
O2 - BHO: Skype add-on (mastermind) - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Skype add-on (mastermind) - {CC59E0F9-7E43-44FA-9FAA-8377850BF205} - D:\Sindre\Prog\Free Download Manager\iefdm2.dll
O2 - BHO: Skype add-on (mastermind) - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: (no name) - {CCC7A320-B3CA-4199-B1A6-9F516DD69829} - (no file)
O3 - Toolbar: - -
O4 - HKCU\..\Run: [ehTray.exe] C:\Windows\ehome\ehTray.exe
O4 - HKCU\..\Run: [EasyTether] "C:\Program Files\Mobile Stream\EasyTether\easytthr.exe"
O4 - HKLM\..\Run: [RtHDVCpl] RtHDVCpl.exe
O8 - Extra context menu item: Add to Google Photos Screensa&ver - res://C:\Windows\system32\GPhotos.scr/200
O8 - Extra context menu item: Download video with Free Download Manager - file://D:\Sindre\Prog\Free Download Manager\dlfvideo.htm
O8 - Extra context menu item: Nedlasting alle med Free Nedlasting Manager - file://D:\Sindre\Prog\Free Download Manager\dlall.htm
O8 - Extra context menu item: Nedlasting med Free Nedlasting Manager - file://D:\Sindre\Prog\Free Download Manager\dllink.htm
O8 - Extra context menu item: Nedlasting valgte med Free Nedlasting Manager - file://D:\Sindre\Prog\Free Download Manager\dlselected.htm
O9 - Extra button: &Blogg dette i Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} -
O9 - Extra button: Skype add-on for Internet Explorer - {5067A26B-1337-4436-8AFE-EE169C2DA79F} -
O9 - Extra button: Skype - {77BF5300-1474-4EC7-9980-D32B190E9B07} -
O16 - DPF: {166B1BCA-3F9C-11CF-8075-444553540000} (Shockwave ActiveX Control) -
http://download.macr...director/sw.cab
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) -
http://download.micr...heckControl.cab
O16 - DPF: {20A60F0D-9AFA-4515-A0FD-83BD84642501} (Checkers Class) -
http://messenger.zon...kr.cab56986.cab
O16 - DPF: {233C1507-6A77-46A4-9443-F871F945D258} (Shockwave ActiveX Control) -
http://download.macr...director/sw.cab
O16 - DPF: {48DD0448-9209-4F81-9F6D-D83562940134} (MySpace Uploader Control) -
http://lads.myspace....ploader1006.cab
O16 - DPF: {5C051655-FCD5-4969-9182-770EA5AA5565} (Solitaire Showdown Class) -
http://messenger.zon...wn.cab56986.cab
O16 - DPF: {67A5F8DC-1A4B-4D66-9F24-A704AD929EEE} (System Requirements Lab Class) -
http://www.nvidia.co.../sysreqlab2.cab
O16 - DPF: {8AD9C840-044E-11D1-B3E9-00805F499D93} (Java Plug-in 1.6.0_22) -
http://java.sun.com/...indows-i586.cab
O16 - DPF: {8C292180-8BB2-495F-B94B-89FE9F2B530A} (ccr_downloader Control) -
http://rfonline-full..._downloader.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) -
http://messenger.zon...nt.cab56907.cab
O16 - DPF: {CAFEEFAC-0016-0000-0007-ABCDEFFEDCBA} (Java Plug-in 1.6.0_07) -
http://java.sun.com/...indows-i586.cab
O16 - DPF: {CAFEEFAC-0016-0000-0022-ABCDEFFEDCBA} (Java Plug-in 1.6.0_22) -
http://java.sun.com/...indows-i586.cab
O16 - DPF: {CAFEEFAC-FFFF-FFFF-FFFF-ABCDEFFEDCBA} (Java Plug-in 1.6.0_22) -
http://java.sun.com/...indows-i586.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} -
http://fpdownload2.m...ent/swflash.cab
O16 - DPF: {F5A7706B-B9C0-4C89-A715-7A0C6B05DD48} (Minesweeper Flags Class) -
http://messenger.zon...er.cab56986.cab
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: Bonjour-tjeneste (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: Dragon Age: Origins - Content Updater (DAUpdaterSvc) - BioWare - D:\Sindre\Spill\Dragon Age\bin_ship\DAUpdaterSvc.Service.exe
O23 - Service: FABS - Helping agent for MAGIX media database (Fabs) - MAGIX AG - C:\Program Files\Common Files\MAGIX Services\Database\bin\FABS.exe
O23 - Service: Firebird Server - MAGIX Instance (FirebirdServerMAGIXInstance) - MAGIX® - C:\Program Files\Common Files\MAGIX Services\Database\bin\fbserver.exe
O23 - Service: GameConsoleService - WildTangent, Inc. - C:\Program Files\WildGames\Game Console - WildGames\GameConsoleService.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: IviRegMgr - InterVideo - C:\Program Files\Common Files\InterVideo\RegMgr\iviRegMgr.exe
O23 - Service: Performance Service (nTuneService) - NVIDIA - C:\Program Files\NVIDIA Corporation\nTune\nTuneService.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\Windows\system32\nvvsvc.exe
O23 - Service: PnkBstrA - Unknown - C:\Windows\system32\PnkBstrA.exe
O23 - Service: Sony Ericsson PCCompanion - Avanquest Software - C:\Program Files\Sony Ericsson\Sony Ericsson PC Companion\PCCService.exe
O23 - Service: StarWind AE Service (StarWindServiceAE) - StarWind Software - D:\Sindre\Prog\Alcohol 120\StarWind\StarWindServiceAE.exe
O23 - Service: Steam Client Service - Valve Corporation - C:\Program Files\Common Files\Steam\SteamService.exe
O23 - Service: Update Center Service (UpdateCenterService) - NVIDIA - C:\Program Files\NVIDIA Corporation\System Update\UpdateCenterService.exe
O23 - Service: Cisco AnyConnect VPN Agent (vpnagent) - Cisco Systems, Inc. - C:\Program Files\Cisco\Cisco AnyConnect VPN Client\vpnagent.exe
O23 - Service: @%ProgramFiles%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown - %ProgramFiles%\Windows Media Player\wmpnetwk.exe
Thanks for the persistance