I noticed a few days ago that my Norton's ANTIVIRUS icon had disappeared from the notification area of the task bar. I tried restarting it from the Start menu but it wouldn't run.

I reinstalled it but I noticed that all exe files were being deleted as soon as they were written to the hard drive. I tried AVG Antivirus too and as I was installing it I watched the folder that I was installing it too, lo and behold, the exe files GOT deleted as soon as the installation finished as if by magic....they just disappeared!

I cannot install any Antivirus software at all. Exe files related to any antivirus software simply disappear from their folders!

I have tried various online virus scanners and they say I'm CLEAN. Ad-aware says I'm clean.

Is this a virus, trojan, or something else? If it is something nasty has anyone come across this before and what can I do to FIX it?Reboot into safe mode and run the antivirus scan.Thanks for your reply. I give it a try tomorrow and post the results....if any I can't seem to start my PC in safe mode. I can get to the option screen but I get a BoD.

Still can't install any antivirus at all.

I guess this is going to end up with me reformatting the C DriveThe problem may be more then just malware alone.

Have you tried doing a repair install?Fixed!

It was malware! (but can't find the logfile and for the life of me can't remember it's name)

I ran Trojan Remover and it found hidden registry entries pointing to a hidden executable also resident in MEMORY. Cleared that and bingo! Antivirus is now installed and working.

Phew!

Thanks for the help.