Virus and spyrware rid?

what are the best ways of gettin rid of viruses and spyware/adware, because i know my computer is infected. I know I’d once had a trojan on it mcafee got rid of it but know my internet pages always act up if i exit one page it freezes up the others an these CiD popups won’t stop

I personally use Avast as my Anti-spyware:

http://www.avast.com/eng/download.html

And Ad-Aware for Anti-spyware:

http://lavasoft.com/products/ad_aware_free.php

Both free and great.

My Advanced Visual Basic Web Browser – Web Browser V6