Because IE is fairly integrated with the operating system (too integrated, many would argue), perhaps something was corrupted when the virus was removed. I'd also do some scanning for spyware just in case, but if you're fairly sure that the virus is gone, give Firefox a whirl and you may not ever look back.
Just for kicks, if you want to try and restore IE, you might want to try a full uninstall of IE and then reinstall IE8 and see what happens. If you simply try to upgrade/reinstall, some of the old, corrupted files might be carried over.
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