I've been having the same problem for a few weeks and have tried all the same fixes. Here's my HijackThis log; I'd appreciate any help. Thanks.
Logfile of HijackThis v1.99.0
Scan saved at 8:13:07 PM, on 2/1/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashserv.exe
C:\WINDOWS\System32\Fast.exe
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\pctspk.exe
C:\WINDOWS\System32\hkcmd.exe
C:\Program Files\Dell\AccessDirect\dadapp.exe
C:\Program Files\Dell\AccessDirect\DadTray.exe
C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe
C:\Program Files\Microsoft Hardware\Mouse\point32.exe
C:\WINDOWS\System32\taskswitch.exe
C:\WINDOWS\System32\fast.exe
C:\Program Files\Alwil Software\Avast4\ashDisp.exe
C:\Program Files\ScanSoft\OmniPageSE\opware32.exe
C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
C:\WINDOWS\system32\prvdi.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Power tools\FreeRAM XP Pro 1.40.exe
C:\PROGRA~1\PANICW~1\POP-UP~1\PSFree.exe
C:\Program Files\Microsoft ActiveSync\WCESCOMM.EXE
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\WINDOWS\SYSTEM32\ZoneLabs\vsmon.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\Paul\Desktop\HijackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL =
http://my.msn.comR1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\WINDOWS\Downloaded Program Files\CopernicMeta.dll/SearchBar_htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page =
http://my.msn.com/R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page =
http://quickmetasearch.com/?said=acc0000_hoR1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) =
http://red.clientapps.yahoo.com/customize/ycomp/defaults/su/*http://www.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R3 - URLSearchHook: (no name) - {DE09D68E-0488-4DF0-BD46-5BF35F2D1F2A} - C:\WINDOWS\DOWNLO~1\COPERN~1.DLL
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: HomePageCtrl Class - {1B9CB0F8-118B-49C1-956D-B703E976F8E3} - C:\Program Files\STHomePage\STHomePage.dll (file missing)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: PCTools Site Guard - {5C8B2A36-3DB1-42A4-A3CB-D426709BBFEB} - C:\PROGRA~1\SPYWAR~1\tools\iesdsg.dll
O2 - BHO: (no name) - {D714A94F-123A-45CC-8F03-040BCAF82AD6} - C:\WINDOWS\Downloaded Program Files\SbCIe028.dll
O3 - Toolbar: Copernic Meta - {F79AD27F-8140-4E33-8B1D-C4FC6B663CCA} - C:\WINDOWS\Downloaded Program Files\CopernicMeta.dll
O4 - HKLM\..\Run: [PCTVOICE] pctspk.exe
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [DadApp] C:\Program Files\Dell\AccessDirect\dadapp.exe
O4 - HKLM\..\Run: [AdaptecDirectCD] C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe
O4 - HKLM\..\Run: [POINTER] point32.exe
O4 - HKLM\..\Run: [CoolSwitch] C:\WINDOWS\System32\taskswitch.exe
O4 - HKLM\..\Run: [FastUser] C:\WINDOWS\System32\fast.exe
O4 - HKLM\..\Run: [avast!] C:\Program Files\Alwil Software\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [Omnipage] C:\Program Files\ScanSoft\OmniPageSE\opware32.exe
O4 - HKLM\..\Run: [Zone Labs Client] "C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [Windows Service] C:\WINDOWS\system32\prvdi.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [FreeRAM XP] "C:\Program Files\Power tools\FreeRAM XP Pro 1.40.exe" -win
O4 - HKCU\..\Run: [PopUpStopperFreeEdition] "C:\PROGRA~1\PANICW~1\POP-UP~1\PSFree.exe"
O4 - HKCU\..\Run: [H/PC Connection Agent] "C:\Program Files\Microsoft ActiveSync\WCESCOMM.EXE"
O4 - HKCU\..\Run: [Windows Service] C:\WINDOWS\system32\prvdi.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Search Using Copernic Meta - res://C:\WINDOWS\Downloaded Program Files\CopernicMeta.dll/HTML/SearchExt
O9 - Extra button: Create Mobile Favorite - {2EAF5BB1-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\INETREPL.DLL
O9 - Extra button: (no name) - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\INETREPL.DLL
O9 - Extra 'Tools' menuitem: Create Mobile Favorite... - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\INETREPL.DLL
O9 - Extra button: SideStep - {3E230861-5C87-11D3-A1C6-00105A1B41B8} - C:\WINDOWS\Downloaded Program Files\SbCIe028.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: Copernic Meta - file://C:\DOCUME~1\Paul\LOCALS~1\Temp\CopernicMeta0000.cab
O16 - DPF: {640B39C1-D713-464F-92C3-75BD972B95EE} -
http://download.sidestep.com/get/k00719/sb028.cabO16 - DPF: {B6B14E82-E23B-48DE-BFFF-876EC90D9B96} - file://C:\DOCUME~1\Paul\LOCALS~1\Temp\CopernicMetaInstall0000.cab
O16 - DPF: {B991DA79-51F7-4011-98D2-1F2592E82A56} (ACNPlayer2 Class) -
http://204.118.132.145/2_0/ACNePlayer.cabO16 - DPF: {BA83FD38-CE14-4DA3-BEF5-96050D55F78A} -
http://www.flipviewer.com/exe/fvgen1.cabO16 - DPF: {EF0DBA6F-43CE-4B26-9808-2AB38FA0DB29} (MSN Money Ticker) -
http://fdl.msn.com/public/investor/v13/ticker.cabO18 - Protocol: copernicmeta - {9B46B30C-CB70-4551-9806-3238CC816A55} - C:\WINDOWS\DOWNLO~1\COPERN~1.DLL
O23 - Service: avast! iAVS4 Control Service - Unknown - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown - C:\Program Files\Alwil Software\Avast4\ashserv.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: TrueVector Internet Monitor - Zone Labs Inc. - C:\WINDOWS\SYSTEM32\ZoneLabs\vsmon.exe