If you think that the popups are being generated by a site that you're visiting, one option is to switch to a different browser. Opera and Firebird (or whatever it's currently called) both allow you to disable advertising popups. Allegedly the updates to IE that are due this summer in the next XP Service Pack will also provide this function. You can also install a popup-blocker, but these are typically unable to distinguish between a popup that you don't want (ie, advertising) and a popup that you do want (ie, from a link that you clicked on). The above browsers can be set to different options:
- allow all popups
- block all popups
- allow only requested popups (this is the one I use)
However, if you've got adware on your machine, you'll need to find and uninstall it. There are various tools out there that you can run to find out if/what adware is installed on your computer; the one I use is Spybot:
http://www.safer-networking.org/
Unfortunately, about the only thing you can do if it's adware is remove the program it came with (or register it if appropriate), so you have to decide if the irritation factor outweighs the benefits of the program concerned.
Some adware is installed without your knowledge though, and for these cases a tool like Spybot will tell you what you have, and may well be able to clean your system up as well.
If you need any help, please feel free to drop me an email ;-)