Just thought I would make a tiny addition to this topic...

I know most of you probably have virus checkers, but for those who dont... or those who dont wish to pay Mcafee or Nortons fees you can download a FREE version of AVG antivirus... It outperforms the others and they offer it free for "personal use"

Its not a very publicised link (even on their site its very hard to find)

http://free.grisoft.com

Hope this helps...