System tool!

I use avg, it was on the computer at the time I got the malware! System tool just popped up without warning started scanning the computer! I've restored windows to earlier on in the day and so far it seems to be ok! (touch wood)
 
If it does come back download a program called 'hijackthis' which will show you everything that's running in the backgroun (A lot more than task manager shows you) and look for anything suspicious. But, if you do disable stuff do a registry backup first