I assume you've ran spyware/virus scans, since you know your system's infected... 
Anyhow, you need to follow some malware cleaning steps and post on a malware support 
forum for assistance clearing this up.

Follow the pre-posting steps on any One of these sites, before posting a message 
in the spyware/hijacking section. Post only on ONE of these sites. 
CastleCops forums

Spyware Warrior forum

cexx.org discussion boards

P.S. Once your system's cleaned up, Stop using IE as your main browser. Switch to 
a more secure, less malware prone browser such as Firefox or Opera.

Dealing with Unwanted Spyware and Parasites

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