@Rock: As far as I know, Microsoft will still support SP3 for a few more years (the install base is too vast to ignore and they aren’t all upgrading to Windows 7), it’s SP2 that has had its support ended last July.
For free malware scanners you could try
or Bitdefender http://www.bitdefender.com/scanner/online/free.html
If you don’t want to click on my urls, look them up but do take care you are going to their websites.
(thx for the pun url ;-) and the time lapsed maps)