guys over here removed the USB controller and the cd dvd drives ...
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checked and found that there is a KB article from MS ....
http://support.microsoft.com/default.aspx?scid=kb;en-us;977307&sd=rss&spid=14481
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are you running SP1 on Windows 7? if no then can you try to update it
Also do you see something in the event logs?
Thanks