I never do the upgrade option from major Windows versions -- always a clean install. Maybe that's your problem?
I've had 0 problems on Windows8 from a clean install. In fact, it runs fantastic on everything I've installed it on, including a low-spec netbook.
And for the haters: I don't use the metro interface, it's not mandatory. $5 Start8 from Stardock -- boots to regular desktop with normal start menu.
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