[entwisi]

There is of course a couple of options.

Initially, try using an online virus checker to see if that is any better than what you have installed. (You don't mention which AV software you are running)

Then try installing a couple of teh free AVs liek AVG and let them have a go.

Then you have a choice of system restore although I'm not a big fan as it doesn't actually remove any infected files.

Finally there is the sledgehammer approach that needs soem one like me to do. (Take a Linux live CD, boot your PC from that, mount the drives and then remove the files from there.)