(Bolded text is bolded to avoid confusion)
Thanks for the help thus far. My computer is running faster, there are less popups than before, and it seems that I've finally gotten rid of that damn Nail.exe file. 
Here's the new HijackThis logfile:
Logfile of HijackThis v1.99.1
Scan saved at 11:57:38 PM, on 4/22/2005
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)
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\igfxtray.exe
C:\WINDOWS\System32\hkcmd.exe
C:\Program Files\Java\jre1.5.0_01\bin\jusched.exe
C:\Program Files\Common Files\Microsoft Shared\Works Shared\WkUFind.exe
C:\PROGRA~1\NORTON~1\navapw32.exe
C:\Program Files\Common Files\Symantec Shared\Security Center\UsrPrmpt.exe
C:\Program Files\Microsoft AntiSpyware\gcasServ.exe
C:\Program Files\Microsoft AntiSpyware\gcasDtServ.exe
C:\Program Files\ewido\security suite\ewidoctrl.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\HijackThis\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page =
http://www.yahoo.com/
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [GWMDMMSG] GWMDMMSG.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_01\bin\jusched.exe
O4 - HKLM\..\Run: [WorksFUD] C:\Program Files\Microsoft Works\wkfud.exe
O4 - HKLM\..\Run: [Microsoft Works Portfolio] C:\Program Files\Microsoft Works\WksSb.exe /AllUsers
O4 - HKLM\..\Run: [Microsoft Works Update Detection] C:\Program Files\Common Files\Microsoft Shared\Works Shared\WkUFind.exe
O4 - HKLM\..\Run: [NAV Agent] C:\PROGRA~1\NORTON~1\navapw32.exe
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe
O4 - HKLM\..\Run: [SSC_UserPrompt] C:\Program Files\Common Files\Symantec Shared\Security Center\UsrPrmpt.exe
O4 - HKLM\..\Run: [gcasServ] "C:\Program Files\Microsoft AntiSpyware\gcasServ.exe"
O4 - HKLM\..\Run: [USB controller] "C:\DOCUME~1\Owner\LOCALS~1\Temp\ICD1.tmp\svcmm32.exe" /startup
O4 - HKLM\..\Run: [razin] C:\DOCUME~1\Owner\LOCALS~1\Temp\rm05040901.Stub.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: strings.exe
O9 - Extra button: AIM - {AC9E2541-2814-11d5-BC6D-00B0D0A1DE45} - C:\Program Files\AIM\aim.exe
O16 - DPF: {DF780F87-FF2B-4DF8-92D0-73DB16A1543A} (PopCapLoader Object) -
http://download.games.yahoo.com/game...ploader_v6.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{29DF46C9-A4BC-471F-B55B-362BE2954472}: NameServer = 151.164.17.201 151.164.11.201
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O23 - Service: ewido security suite control - ewido networks - C:\Program Files\ewido\security suite\ewidoctrl.exe
O23 - Service: ewido security suite guard - ewido networks - C:\Program Files\ewido\security suite\ewidoguard.exe
O23 - Service: Norton AntiVirus Auto Protect Service (navapsvc) - Symantec Corporation - C:\Program Files\Norton AntiVirus\navapsvc.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\COMMON~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe
O23 - Service: System Startup Service (SvcProc) - Unknown owner - c:\windows\SvcProc.exe (file missing)
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\Security Center\SymWSC.exe
I ran the rkfiles.bat, and all I got was this:
C:\WINDOWS\system32\delfin0414.dll: UPX!
C:\WINDOWS\system32\goldnew2b0414.dll: UPX!
C:\WINDOWS\system32\dfrg.msc: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAAwGpEc213
I also ran rem.bat, and I got:
Files Found.................
----------------------------------------
Files Not deleted.................
----------------------------------------
Merging registry entries
-----------------------------------------------------------------
The Registry Entries Found...
-----------------------------------------------------------------
Other bad files to be Manually deleted.. Please note that this might also list legit Files, be careful while deleting
-----------------------------------------------------------------
Volume in drive C has no label.
Volume Serial Number is 20E0-FAEF
Directory of C:\WINDOWS\system32
msi.dll
Finished
Again, thanks for the help so far.
~ RS