I have been trying to get rid of these viruses now for ages and they seem to be regenerating themselves. I have tried numerous virus removal programs Mcaffee Nortons Tuneup 2008 Ad Aware Kaspersky 7.0 which did not insall. The Ad Aware has quarantined 27 files but three for some reason are not letting me quarantine them. I found a post to this forum while searching for a file name nvcoi and nodns. I found your link to download combofix but when I printed the guide it was for xp. I am currently running windows 2000 professional sp4. which day to day seems to be gliding along a razors edge. Is there a combofix program for windows 2000. Now for the listed infections that I am primarily concerned about; Infections Found Family Id Name Category TAI 799 Win32.Backdoor.Agent Virus 10 [100010402] File: c:\windows\system32\syscfg32.exe [100010402] Process CSI: c:\windows\system32\syscfg32.exe [300017021] Root: HKU Path: .DEFAULT\software\microsoft\windows\currentversion\explorer Value: ...(more)