I have the window refresh issues too and mine is also 64 bit.
I do a fair amount of video stuff and Win7 on my i7-920 cuts through encoding jobs like a hot knife through butter.
What I am annoyed with is the time it takes to launch an installation package. I wait 30-60 seconds and Win7 finally comes back and says 'this program is trying to run, do you want to allow it?' MY UAC is just 1 level above 'off' and I don't so much mind the prompt, but do mind the wait.
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