Ask someone to download and burn this one:
http://www.free-av.com/en/products/1...ue_system.html
Run it on your PC, check EVERYTHING (including archived files, cookies, ahwell, everything). It's pretty self explaining and easy to use.
Nothing will be installed on your PC. It runs completely from the CD and it is kept up to date.
BTW, it will be needless to clean up your system if you stick in an infected USB key, self burned CD, or run whatever program that's infected, you'll go in no time back to square one and will have an infected and screwed up system again.
And stay away from those pron sites.