So run a spyware program (like spybot)and make sure your "popup" blocker is on - its probably a third party cookie that has been installed - i block ALL 3rd party cookie (see privacy section in IE options).
While you are in the options menu delete all cookies and files.
OR you can download the program and try it if you want
yea my computer has not been in use for the last month because i blew out my motherboard, now i got a new one and i keep getting these pop ups titles "Messenger Service" and it will read something like "Message from SECURITY to ALERT on 6/11/2005 7:28:21 PM STOP! WINDOWS REQUIRES IMMEDIATE ATTENTION. Windows has found CRITICAL SYSTEM ERRORS To fix the errors please do the following:
1. Download Registry Repair from: http://www.windowsregfix.com
2. Install Rregistry Repair
3. Run Registry Repair
4. Reboot your computer
FAILURE TO ACT NOW MAY LEAD TO DATA LOSS AND CORRUPTION
What should I do? The website and something else differs everytime. I'm running Windows XP pro Pentium 3 1 ghz