Get a PC. Not that that would help, but that seems to be the Mac Fanboy's canned answer for anything that goes wrong with a computer not made by Apple.
Just a few questions/suggestions: Have you done a cold re-boot? Have you reset the perimeter ram (hold down the Command, Option, P and R keys during a bootup until you've heard at lest three sets of startup chimes)? Do you have another browser, does it exhibit the same condition? (if you don't have a second browser try Firefox).