A little more information would be useful. Try first installing/updating
and running the following:
Lavasoft AdAware - follow the link here -> http://www.dcnetworks.com.au/resources.htm
That's a start, but try and tell us more specifically about the popups
you're getting, also, if you use Msn Messenger, disable as much of the
advertising as you can. For example there are options to display the
"MSN Today" Pages...
good luck
sh4d03
First, update your software. From the headers of your post ...
X-Newsreader: Microsoft Outlook Express 5.50.4927.1200
This ancient version will auto execute many forms of malware, allowing
your computer to be infected just by viewing a message.
Once you've updated your software, try running an online virus scan.
See http://www.claymania.com/safe-hex.html for general virus prevention
tips, and links to various virus scanners.