Try running memtest86 and Prime95. If you get errors in either one, then you are not totally stable, and thus will have errors. You may have to let Prime95 run for a long time, read the "readme's" that come with it when you download it. Good luck.
Is it anything other than the browsers? If not it could be a virus / spyware etc. Does your broswer redirect you to any random pages or reset your homepage. Go to <a href="http://www.trendmicro.com" target="_blank">www.trendmicro.com</a> and do the housecall, it is a pretty go sweep if you dont have other anti-virus.
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