Yes it is pretty common. These google/yahoo hacks go back to 2005 so there are lots of nasties and malware that are capable of this behavior.
Goto download.com and get the anti-malware program "hijackthis". Run it and disable any BHO(browser helper objects) if that does not solve it then post the Hijackthis log to the forums, it is a simple button push from within HJT.
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Last edited by Snaz; 02-07-2009 at 07:29 PM.
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