Ignore the format comment above please. It will erase your harddrive.
Go here and download:
http://www.lavasoftusa.com/support/download/
Install
Let it update its definitions and Run the Scan
It is the best one for free.
After that you can do a search for "Spybot search and destroy" on google. And run that one too. It might catch things Adaware did not.
Lastly download firefox or Mozilla and don't use IE.
I have worked on many, many pc's that have been highly infected with viruses and spyware and only about 10% of them will come out 100% cleaned with out problems. For his machine to be totally cleaned he will end up formatting it..
I already tried lavasoft's "ad-aware." It didn't work. It said I didn't have proper definitions, or some malarchy like that.