[holymoly]

Though you've gotten some good advice already, you might want to scan your system with Dr. Web CureIT.

Dr. Web CureIT is "a FREE anti-virus and anti-spyware scanner based on the Dr.Web engine which will help you quickly scan and cure, if necessary, a computer operated by MS Windows 95OSR2/ 98/Me/NT 4.0/2000/XP without installation of the Dr.Web Anti-virus."

Dr. Web CureIT does not require installation.

Since it appears your browser has been hi-jacked, I assume you're using MSIE.

If you MUST use MSIE, make sure you use Spybots' "Immunize" feature. Also, enable "SDHelper" and "TeaTimer".

Note: There's a small bug in the Spybot 1.4 TeaTimer pop-up, addressed here: Solution to fix the pop-ups in TeaTimer

Also, download, update, and use SpywareBlaster. There is a small bit of overlap with Spybots' "Immunize" feature, but this will not cause any problems.

If you ARE using MSIE, you may want to consider an alternative:

Mozilla.org Firefox the Mozilla Suite

Opera

[holymoly]

And before I forget, if you aren't already using one, you may want to consider a HOSTS file:

Blocking Unwanted Parasites with a Hosts File