It would seem that if your amd based machine came from an assembly line, you will eventually run into this problem because of the lazyness of that companies software deployment team.
Essentially they use the same image they use on Intel machines to install your operating system and software. This causes a problem when you upgrade an AMD based machine because windows is configured to use the intel power management driver (on an amd processor?)
Hope is out there, because there is a fix
if by chance you cannot enter safe mode because of certian problems, this page
might offer some insight.