how do I install or find userint32.exe ?

Running a good scanners, registry scanners, or any scanners that removes the bad reg entry should fix it, as orangutang and sparkmaker also suggested.

Hijackthis possible entry to fix:(if not in the 04 line)
F2 - REG:system.ini: Shell=Explorer.exe C:\WINDOWS\userint32.exe


Alternatively you can remove the reg entry yourself in the registry.
 Startup Registry Keys:
  HKLM\Software\Microsoft\Windows\CurrentVersion\Run
  HKCU\Software\Microsoft\Windows\CurrentVersion\Run
  HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit  
  HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce  
  HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce  
  HKLM\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
  HKCU\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
  HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
  HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
  HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnceEx  
  HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
  HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
 

For more information about that particular piece of malware, see this Trend Micro article:

WORM_OPANKI.L

http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM%5FOPANKI%2EL&VSect=T

@souseran-->I believe I already posted that link

@sparkmaker,

You did. Left that window open *way* too long.

I often forget where the refresh button is myself.

Forced accept.

Computer101
EE Admin