Just to make things clear, are you updating to windows 7 or are you wanting to do a full clean install?
If this is a full install, then I do suggest setting it to stock as Sky mentioned. Also you should make sure you have nothing extra plugged into you machine, printers, external drives, etc.
I have installed Windows 7 on quite a few machines and so far they have all worked without issue, but non of them are overclocked when I installed.
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