Here's a quick way on Windows Systems to see if you're infected with a Klez variant, according to VirusList.com: Go to Start: Find: Files or Folders. (It may be Start: Search: Files or Folders depending on your OS.) In the Named field, type: krn132.exe Make sure you are looking on your C drive and looking in all subfolders. (If somehow you got your OS on something other than the C drive, change the drive letter accordingly.) krn132.exe is the source file for the virus. If you're feeling adventurous, you can go look in your registry in: H_Key_Local_MachineSoftwareMicrosoftWindowsCurrentVersionRun Krn132 = %System%Krn132.exe (If you don't know how to look in your registry, you shouldn't be in there.) :-) Unfortunately, some viruses can disable your antivirus software, or tell the software to ignore it. At least in Symantec, you can check the Exclusion List and see if there's anything wacky in there. I have XP and only have *.nch and *.dbx in the Exclusion List which Symantec says should be ignored. AFAIK, the virus will show up on the Exclusion List if it is screwing with Symantec. (I check the List every so often to make sure nothing added itself in.) Hope this helps!