You need a popup manager in addition to ad-aware. If advertising is popping up all by itself you have spyware already installed on your computer. Ad-Aware will identify it and delete it - it is also a free program. Then, you need a popup blocker so that spyware doesn't install on your computer in the future. I use popup manager and have for at least 3 years - it is also free - and I have never had problems with it. Here is the link:
http://www.endpopups.com/
and here is ad-aware (there are paid versions but the basic version is free)
http://www.lavasoft.de/
Kathleen