Recurring MULTIMPP (Offeroptimizer)

Thanks to the great posts, I was able to nail down my pop-up problem (after following timberland's great instructions) to a BHO using multimpp.dll - HJT log follows. I have deleted this file in safe mode and cleaned the registry of all references to it (it also uses a file called preinmpp.exe), yet it still keeps installing itself when I log into XP. Any ideas on how to get rid of it? Thanks.
Logfile of HijackThis v1.98.2
Scan saved at 10:09:45 AM, on 10/22/2004
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:\WINDOWS\system32\dla\tfswctrl.exe
C:\Program Files\Creative\SBAudigy2\Surround Mixer\CTSysVol.exe
C:\Program Files\Creative\SBAudigy2\DVDAudio\CTDVDDet.EXE
C:\WINDOWS\system32\CTHELPER.EXE
C:\WINDOWS\System32\DSentry.exe
C:\Program Files\Dell\Media Experience\PCMService.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\Program Files\Ideazon\Zboard Software\Driver\Zboard.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\Program Files\Ideazon\Zboard Software\Driver\ZboardTray.exe
C:\Program Files\Common Files\Dell\EUSW\Support.exe
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
C:\WINDOWS\System32\CTsvcCDA.exe
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\Program Files\Norton SystemWorks\Norton AntiVirus\navapsvc.exe
C:\Program Files\Norton SystemWorks\Norton Utilities\NPROTECT.EXE
C:\Program Files\Common Files\Sonic\Update Manager\sgtray.exe
C:\Program Files\Logitech\ioSoftware\Logitech.Pen.TrayIcon.exe
C:\Program Files\MUSICMATCH\MUSICMATCH Jukebox\mmtask.exe
C:\Program Files\Creative\ShareDLL\CtNotify.exe
C:\Program Files\Microsoft IntelliPoint\point32.exe
C:\Program Files\MSN Apps\Updater\01.02.3000.1001\en-us\msnappau.exe
C:\WINDOWS\system32\riadfq.exe
C:\Program Files\Creative\ShareDLL\MediaDet.Exe
c:\program files\logitech\iosoftware\Logitech.Pen.LplsHost.exe
C:\Program Files\Logitech\ioSoftware\Logitech.FileSystem.AccessManager.Server.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\PROGRA~1\NORTON~1\SPEEDD~1\nopdb.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\MsPMSPSv.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Logitech\Profiler\lwemon.exe
C:\Program Files\Logitech\Desktop Messenger\8876480\Program\BackWeb-8876480.exe
C:\Program Files\Creative\PlayCenter2\CTNMRUN.EXE
C:\Program Files\Plaxo\2.0.4.58\InstallStub.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Documents and Settings\Chris\My Documents\Hijackthis\HijackThis.exe
C:\Program Files\Messenger\msmsgs.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.dell.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://my.msn.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.dell.com
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost
R3 - Default URLSearchHook is missing
O2 - BHO: MultimppObj Class - {002EB272-2590-4693-B166-FBD5D9B6FEA6} - C:\WINDOWS\multimpp.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\system32\dla\tfswshx.dll
O2 - BHO: ST - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - C:\Program Files\MSN Apps\ST\01.02.3000.1002\en-xu\stmain.dll
O2 - BHO: MSNToolBandBHO - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Apps\MSN Toolbar\01.02.3000.1001\en-us\msntb.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: MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Apps\MSN Toolbar\01.02.3000.1001\en-us\msntb.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [dla] C:\WINDOWS\system32\dla\tfswctrl.exe
O4 - HKLM\..\Run: [CTSysVol] C:\Program Files\Creative\SBAudigy2\Surround Mixer\CTSysVol.exe
O4 - HKLM\..\Run: [CTDVDDet] C:\Program Files\Creative\SBAudigy2\DVDAudio\CTDVDDet.EXE
O4 - HKLM\..\Run: [CTHelper] CTHELPER.EXE
O4 - HKLM\..\Run: [AsioReg] REGSVR32.EXE /S CTASIO.DLL
O4 - HKLM\..\Run: [UpdReg] C:\WINDOWS\UpdReg.EXE
O4 - HKLM\..\Run: [DVDSentry] C:\WINDOWS\System32\DSentry.exe
O4 - HKLM\..\Run: [PCMService] "C:\Program Files\Dell\Media Experience\PCMService.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [ZBoard] C:\Program Files\Ideazon\Zboard Software\Driver\Zboard.exe
O4 - HKLM\..\Run: [ZboardTray] C:\Program Files\Ideazon\Zboard Software\Driver\ZboardTray.exe /autolaunch
O4 - HKLM\..\Run: [DwlClient] C:\Program Files\Common Files\Dell\EUSW\Support.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: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [UpdateManager] "C:\Program Files\Common Files\Sonic\Update Manager\sgtray.exe" /r
O4 - HKLM\..\Run: [Logitech.Pen.TrayIcon] C:\Program Files\Logitech\ioSoftware\Logitech.Pen.TrayIcon.exe
O4 - HKLM\..\Run: [mmtask] C:\Program Files\MUSICMATCH\MUSICMATCH Jukebox\mmtask.exe
O4 - HKLM\..\Run: [Disc Detector] C:\Program Files\Creative\ShareDLL\CtNotify.exe
O4 - HKLM\..\Run: [IntelliPoint] "C:\Program Files\Microsoft IntelliPoint\point32.exe"
O4 - HKLM\..\Run: [msnappau] "C:\Program Files\MSN Apps\Updater\01.02.3000.1001\en-us\msnappau.exe"
O4 - HKLM\..\Run: [Win Server Updt] C:\WINDOWS\wupdt.exe
O4 - HKLM\..\Run: [zkyjgpnldaje] C:\WINDOWS\system32\riadfq.exe
O4 - HKCU\..\Run: [SB Audigy 2 Startup Menu] /L:ENG
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Start WingMan Profiler] "C:\Program Files\Logitech\Profiler\lwemon.exe" /noui
O4 - HKCU\..\Run: [LDM] C:\Program Files\Logitech\Desktop Messenger\8876480\Program\BackWeb-8876480.exe
O4 - HKCU\..\Run: [NOMAD Detector] "C:\Program Files\Creative\PlayCenter2\CTNMRUN.EXE"
O4 - HKCU\..\Run: [PlaxoUpdate] C:\Program Files\Plaxo\2.0.4.58\InstallStub.exe -a
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Program Files\Logitech\Desktop Messenger\8876480\Program\LDMConf.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~4\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~4\OFFICE11\REFIEBAR.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: {01A88BB1-1174-41EC-ACCB-963509EAE56B} (SysProWmi Class) - http://support.dell.com/systemprofiler/SysPro.CAB
O16 - DPF: {08BEF711-06DA-48B2-9534-802ECAA2E4F9} (PlxInstall Class) - https://www.plaxo.com/down/release/PlaxoInstall.cab
O16 - DPF: {544EB377-350A-4295-9BEB-EAB8392E09C6} (MSN Money Charting) - http://fdl.msn.com/public/investor/v13/invinstl.exe
O16 - DPF: {62475759-9E84-458E-A1AB-5D2C442ADFDE} - http://a1540.g.akamai.net/7/1540/52/20031216/qtinstall.info.apple.com/mickey/us/win/QuickTimeInstaller.exe
O16 - DPF: {AE1C01E3-0283-11D3-9B3F-00C04F8EF466} (HeartbeatCtl Class) - http://fdl.msn.com/zone/datafiles/heartbeat.cab
O16 - DPF: {BB47CA33-8B4D-11D0-9511-00C04FD9152D} (ExteriorSurround Object) - http://autos.msn.com/components/ocx/exterior/Outside.cab
O16 - DPF: {C2FCEF52-ACE9-11D3-BEBD-00105AA9B6AE} (Symantec RuFSI Registry Information Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab