Dammed lap top is coming up with all sorts of errors, ones that are saying enable windows firewall protection, and then links coming up to so called virus eradicating sites or what ever there called. Dammed computer geek whats the point

I was looking at the thread earlier about defraging so I think i've done that, but dont know how to wipe my temp files, cookies or other things that may help?????
I'm running windows vista basic. Any tips

Thank you