HEY!!! I have the same problem. My homepage was changed from Yahoo to About:Blank. I've tried CW Shredder, Adware Away, SpySweeper, HiJackThis, Adaware, Spybot Search & Destroy, Trojan Killer, Spyware Blaster, Norton Antivirus, AVG Antivirus, and some online antivirus scanners (Trend Housecall, Panda, and BitDefender). Nothing has worked.