Sounds like spyware.
Let us take a closer look at what is running on your PC. We'll need you to use a free diagnostic tool (HiJackThis) and post a log back here with the results.
Click the HijackThis Guide in my signature, download it and follow the instructions in the guide.
Most of what it lists will be harmless or even essential, DO NOT delete or modify anything yet! Someone will be along to tell you what steps to take after you post the contents of the scan results.

Here in the Hi-Jack log 11-5-2004
Logfile of HijackThis v1.98.2
Scan saved at 10:41:50 PM, on 11/5/2004
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)
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:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\Program Files\Norton Personal Firewall\NISUM.EXE
C:\Program Files\Compaq\EAB\EabServr.exe
C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\WINDOWS\System32\atiptaxx.exe
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
C:\WINDOWS\System32\rpcxsys.exe
C:\WINDOWS\System32\SystemMgr.exe
C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe
C:\Program Files\Adaptec\Easy CD Creator 5\DirectCD\DirectCD.exe
C:\WINDOWS\System32\slpgktmlw.exe
C:\PROGRA~1\PANICW~1\POP-UP~1\PSFree.exe
C:\Program Files\Netscape\Netscape\Netscp.exe
C:\Program Files\blueyonder IST\bin\mpbtn.exe
C:\Program Files\Norton Personal Firewall\ccPxySvc.exe
C:\WINDOWS\Cpqdiag\Cpqdfwag.exe
C:\Program Files\Yahoo!\Messenger\ymsgr_tray.exe
C:\Program Files\Norton SystemWorks\Norton AntiVirus\navapsvc.exe
C:\Program Files\Norton SystemWorks\Norton Utilities\NPROTECT.EXE
C:\PROGRA~1\NORTON~1\SPEEDD~1\nopdb.exe
C:\WINDOWS\System32\wuauclt.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Documents and Settings\Teddy\Desktop\Downloads\Hi Jack This\HijackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page_bak = www.blueyonder.co.uk
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Internet Explorer Provided by blueyonder
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = 127.0.0.1
N3 - Netscape 7: user_pref("browser.search.defaultengine", "engine://C%3A%5CProgram%20Files%5CNetscape%5CNetscape%5Csearchplugins%5CSBWeb_01.src"); (C:\Documents and Settings\Teddy\Application Data\Mozilla\Profiles\default\vf1vo1wt.slt\prefs.js)
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Program Files\Norton SystemWorks\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Program Files\Norton SystemWorks\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [eabconfg.cpl] C:\Program Files\Compaq\EAB\EabServr.exe /Start
O4 - HKLM\..\Run: [SynTPLpr] C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [ATIModeChange] Ati2mdxx.exe
O4 - HKLM\..\Run: [AtiPTA] atiptaxx.exe
O4 - HKLM\..\Run: [ccApp] "C:\Program Files\Common Files\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [ccRegVfy] "C:\Program Files\Common Files\Symantec Shared\ccRegVfy.exe"
O4 - HKLM\..\Run: [Workflow] D:\Workflow.exe
O4 - HKLM\..\Run: [Microsoft Windows Key] rpcxsys.exe
O4 - HKLM\..\Run: [System manager] SystemMgr.exe
O4 - HKLM\..\Run: [Microsoft Update Machine] slpgktmlw.exe
O4 - HKLM\..\Run: [RemoteControl] "C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [AdaptecDirectCD] "C:\Program Files\Adaptec\Easy CD Creator 5\DirectCD\DirectCD.exe"
O4 - HKLM\..\RunServices: [CPQDFWAG] C:\WINDOWS\Cpqdiag\CpqDfwAg.exe
O4 - HKLM\..\RunServices: [Microsoft Windows Key] rpcxsys.exe
O4 - HKLM\..\RunServices: [System manager] SystemMgr.exe
O4 - HKLM\..\RunServices: [Microsoft Update Machine] slpgktmlw.exe
O4 - HKCU\..\Run: [Yahoo! Pager] C:\Program Files\Yahoo!\Messenger\ypager.exe -quiet
O4 - HKCU\..\Run: [System manager] SystemMgr.exe
O4 - HKCU\..\Run: [Microsoft Update Machine] slpgktmlw.exe
O4 - HKCU\..\Run: [Windows Compliant] tafhco.exe
O4 - HKCU\..\Run: [PopUpStopperFreeEdition] C:\PROGRA~1\PANICW~1\POP-UP~1\PSFree.exe
O4 - HKCU\..\Run: [Mozilla Quick Launch] "C:\Program Files\Netscape\Netscape\Netscp.exe" -turbo
O4 - HKCU\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: blueyonder Instant Support Tool.lnk = C:\Program Files\blueyonder IST\bin\matcli.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) -
http://security.syma...bin/AvSniff.cabO16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) -
http://v5.windowsupd...b?1098952235813O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) -
http://security.syma...n/bin/cabsa.cabO16 - DPF: {CE28D5D2-60CF-4C7D-9FE8-0F47A3308078} (ActiveDataInfo Class) -
https://www-secure.s...ta/SymAData.cabO16 - DPF: {E77C0D62-882A-456F-AD8F-7C6C9569B8C7} (ActiveDataObj Class) -
https://www-secure.s.../ActiveData.cabThanks for your help