Just another thought on this item.
I tried that solution with no success.
Based on my company's research, it appears to be motherboard related. Taking out the memory modules may have bypassed the issue, but the root cause seems to be motherboards. This person's some Gigabyte boards, some others as well.
There is a similar thread on the social.answers.microsoft.com site at:http://social.answers.microsoft.com/Forums/en-US/GettingReadyforWindows7/thread/91649357-c70a-42f3-ae33-c69f82380e76?prof=required
We are running into this issue more and more since Vista, and now W7.
Any other salient posts would be appreciated, as we're considering not recommending W7 now to our customers.