Here's the log from the HJT scan. I appreciate your help - my computer's performance ranges from molasses to neurotic to utterly useless. Anyway:

Logfile of HijackThis v1.98.1
Scan saved at 10:56:16 AM, on 8/2/2004
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:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\Program Files\NavNT\defwatch.exe
C:\WINDOWS\wanmpsvc.exe
C:\Program Files\Microsoft Hardware\Keyboard\type32.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\WINDOWS\System32\NETSTATT.EXE
C:\WINDOWS\System32\YahooMsgr.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashmaisv.exe
C:\WINDOWS\simple1.exe
C:\WINDOWS\inetsrv\services.exe
C:\Palm\HOTSYNC.EXE
C:\WINDOWS\System32\devldr32.exe
C:\WINDOWS\explorer.exe
C:\Program Files\Opera75\opera.exe
C:\Program Files\HJT\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://searchportal.info/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,SearchAssistant = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,CustomizeSearch = res://C:\PROGRA~1\Toolbar\toolbar.dll/sa
R1 - HKLM\Software\Microsoft\Internet Explorer\Search,Default_Search_URL = http://www.searchv.com/w/search.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
R3 - Default URLSearchHook is missing
O2 - BHO: myBar BHO - {0494D0D1-F8E0-41ad-92A3-14154ECE70AC} - C:\Program Files\MyWay\myBar\1.bin\MYBAR.DLL
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: REALBAR - {4E7BD74F-2B8D-469E-C0FF-FD60B590A87D} - C:\PROGRA~1\COMMON~1\Real\Toolbar\realbar.dll (file missing)
O2 - BHO: HBO Class - {5321E378-FFAD-4999-8C62-03CA8155F0B3} - C:\WINDOWS\inetsrv\1.00.03.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Copernic Agent - {F2E259E8-0FC8-438C-A6E0-342DD80FA53E} - C:\Program Files\Copernic Agent\CopernicAgentExt.dll (file missing)
O3 - Toolbar: REALBAR - {4E7BD74F-2B8D-469E-C0FF-FD60B590A87D} - C:\PROGRA~1\COMMON~1\Real\Toolbar\realbar.dll (file missing)
O3 - Toolbar: (no name) - {339BB23F-A864-48C0-A59F-29EA915965EC} - (no file)
O3 - Toolbar: &SearchBar - {0494D0D9-F8E0-41ad-92A3-14154ECE70AC} - C:\Program Files\MyWay\myBar\1.bin\MYBAR.DLL
O3 - Toolbar: (no name) - {2CDE1A7D-A478-4291-BF31-E1B4C16F92EB} - (no file)
O4 - HKLM\..\Run: [IntelliType] "C:\Program Files\Microsoft Hardware\Keyboard\type32.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [Yahoo Messenger] NETSTATT.EXE
O4 - HKLM\..\Run: [Yahoo Instant Messengar] YahooMsgr.exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [ashMaiSv] C:\PROGRA~1\ALWILS~1\Avast4\ashmaisv.exe
O4 - HKLM\..\Run: [xp_system] C:\WINDOWS\inetsrv\services.exe
O4 - HKLM\..\Run: [ist service uninstall x] C:\WINDOWS\simple1.exe /u
O4 - HKLM\..\RunServices: [Yahoo Instant Messengar] YahooMsgr.exe
O4 - HKCU\..\Run: [Ahte] C:\Documents and Settings\William\Application Data\asus.exe
O4 - HKCU\..\Run: [Yahoo! Pager] C:\Program Files\Yahoo!\Messenger\ypager.exe -quiet
O4 - HKCU\..\Run: [HXIUL.EXE] C:\Program Files\Alset\HelpExpress\William\HXIUL.EXE
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [PopUpStopperFreeEdition] "C:\PROGRA~1\PANICW~1\POP-UP~1\PSFree.exe"
O4 - HKCU\..\Run: [xp_system] C:\WINDOWS\inetsrv\services.exe
O4 - HKCU\..\RunOnce: [Yahoo Messenger] NETSTATT.EXE
O4 - Startup: HotSync Manager.lnk = C:\Palm\HOTSYNC.EXE
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.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 Agent - C:\Program Files\Copernic Agent\Web\SearchExt.htm
O9 - Extra button: (no name) - {193B17B0-7C9F-4D5B-AEAB-8D3605EFC084} - C:\PROGRA~1\COPERN~1\COPERN~1.EXE (file missing)
O9 - Extra 'Tools' menuitem: Launch Copernic Agent - {193B17B0-7C9F-4D5B-AEAB-8D3605EFC084} - C:\PROGRA~1\COPERN~1\COPERN~1.EXE (file missing)
O9 - Extra button: Copernic Agent - {688DC797-DC11-46A7-9F1B-445F4F58CE6E} - C:\PROGRA~1\COPERN~1\COPERN~1.EXE (file missing)
O9 - Extra button: AIM - {AC9E2541-2814-11d5-BC6D-00B0D0A1DE45} - C:\Program Files\AIM95\aim.exe
O9 - Extra button: PartyPoker.com - {B7FE5D70-9AA2-40F1-9C6B-12A255F085E1} - C:\Program Files\PartyPoker\IEExtension.dll
O9 - Extra 'Tools' menuitem: PartyPoker.com - {B7FE5D70-9AA2-40F1-9C6B-12A255F085E1} - C:\Program Files\PartyPoker\IEExtension.dll
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\System32\Shdocvw.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\MSMSGS.EXE
O9 - Extra 'Tools' menuitem: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\MSMSGS.EXE
O15 - Trusted Zone: www.mt-download.com
O16 - DPF: {02BED220-FBC7-4392-93A2-3A50B056F78E} - http://down.plaxo.com/down/release/instub.cab
O16 - DPF: {1D6711C8-7154-40BB-8380-3DEA45B69CBF} (Web P2P Installer) -