@ R. Proffitt.
I knew about the hit and miss stuff, but I never knew about how it doesn't undo the damage and I didn't know that I didn't need a firewall on either. I'm happy to know that. Thanks.
Thanks for the weblinks.
All I know is that my computer's been running slow extremely bad and the last time this happened, the repair store told me there were viruses and other nasties on it.
Would there be any other ways of looking at it from a difference view, other than maybe my computer's infected?