Hi,
if you are getting Windows Explorer Pop-Ups then you can install some anti
AdWare and SpyWare software. Lavasoft's AdAware does pretty good job and it
is free. You can get it at
www.lavasoftusa.com -> download...
Since it works like Antivirus program it needs to be updated to get latest
signatures.
Also delete all the Cookies on your PC and all the Temporary Internet Files.
If you are getting messenger pop-ups then you should install and use
personal firewall on your PC. You can use any personal firewall on your PC
that you feel comfortable with. There are some pretty good Free ones out
there and WindowsXP come with built in one that will protect you from
Messenger Pop-Ups.
Follow instructions in:
http://www.microsoft.com/windowsxp/pro/using/howto/communicate/stopspam.asp
Also to protect your PC, install and use Antivirus. Don't forget to update
it at least once a week. And to keep your PC healthy, update it regularly.
Visit
www.windowsupdate.com