Hi all, My pc was acting a bit sluggish recently so I decided to empty the Temp Internet Files and run Disk Cleanup on (C)to remove temp files and compress old files. Upon doing so (it took a little while) My antivirus software popped up 3 times saying it had found 2 Win32/Backdoor.APQJ virus and a Trojan.BDPG that it sucessfully deleted.
Now i've had an uptodate virus protection (PCGUARD from VIRGINMEDIA) since the beginning and it updates daily and I run a virus scan weekly and it never found these before.
Does anyone know why it took disk cleanup to find these and also, how they hid on my system for so long?
TIA

My guess is that the virus defenitions came up and updated after your pc was infected.

The malware has been lying dormant in your temp files and were only detected due to them being purged.

If you cleaned the cache file(s) manually they would still have been detected.

This is why it is important to schedule regular scans of your local drive(s). I use the screen saver option in avast to do this (autoscan) so if anything does slip through I can catch it.