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#61
Some more ideas: Try booting Win7 into Safe mode to see if the problem is related to an add-on program or driver instead of the base OS. Here is this forum's tutorial on how to do that:
Advanced Boot Options
One other question: Do you have any external hard drives (MyBook, for example), USB flash/thumb drives, MP3 players, or any other USB or Firewire devices attached to your computer? If so, try unplugging all of them and rebooting Windows.