Sedo Advertisement Redirection

[Thunderbolt]

Typing certain words into my address bar, on Mozilla and IE7 is taking me to a Sedo, or other website advertisment page and not what I requested. For example, typing 'overclockers' into the address bar used to bring me here (in firefox anyway), however now it doesn't.
Any fix for this?
Usually ad-aware helps with this, but not this time...

 

[Duke]

What AV do you have? Give NOD32 trial ago (www.nod32uk.com) and scan in Safe Mode. Also turn off System Restore before hand to clear the crap out.