So last night I was delted my old "trial" version of Mcafee becuase my uncle said AOL offers the full one for free with membership. So I went to go download it and it won't work.

What to do?! What anti-virus programs do you guys use?!
Also, I noticed when I go into my control panel, under the "Add/Remove programs" There's a lot of "programs" called
security update for xp with like a serial number next to it AND
windoxs xp hotfix also with a serial number like thing next to it. I'm trying to delete all my unused/unwanted programs in hopes it makes my PC faster. Ok thanks..