My disk space is being raped by spyware or a virus

I know I have a virus or something, cause I’ll get pop ups in internet explorer, I use firefox, and I think its making files, every day now I have to delete games and shit cause I have 4mb of disk space I want to kill someone, can somebody point me into the direction of a spyware or virus remover thats free?

Get this program: HijackThis
Create a log with it and upload the log somewhere where people can help you, either here or on one of the hijackthis forums like (Bleepingcomputer.com)

This is the best way to get rid of viruses when you know you’re infected.