So, I have had good look around and can't fix this by myself and would be very appreciative if someone would help me out.
I was happily updating myself on what's going on in the world (on my boyfriends computer -oh dear) when I got a message from AVG saying it had detected an infection with prunnet.exe. I quickly disconnected from the internet, put prunnet.exe in the virus vault and proceeded to do a full system scan with AVG which picked up Trojan horse clicker.vzm. I also checked the running processes only to find prunnet still running so I terminated it manually too. On my computer I researched the TH and didn't come up with much but found a bit on prunnet which said use Malawarebytes. Also started to get generic antivirus popups (antivirus2009,2008 downloads) and both firefox and explorer tried to open on their own several times during the virus scan (computer still disconnected to internet)
So, downloaded Malawarebytes (on my computer and transferred via pen drive to infected computer, update from 4.1.09) which came up with Vundo.H and Vundo (delete on reboot) and followed instructions. Upon reboot getting more popups, both mozilla and explorer (still haven't connected to internet since problem began). Second AVG scan now gives Trojan horse Generic12.ATAG.
After dealing with that and another reboot both AVG and Malawarebytes don't detect anything but still getting popups. Also experienced problems with AVG, windows automatic updates and firewall being disabled several times.
Edited by saharanz, 12 January 2009 - 12:17 PM.