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There has been an issue with the Intel driver being reenabled by sp3, in cases where manufacturers used the same disk image for their Intel and AMD processors, and just disabled the Intel one. If you have an AMD and especially if it's a mass-produced unit, a single registry change in safe mode should fix it:
http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=3285530&SiteID=17

I've installed sp3 on both AMD's and Intels successfully without issues, but none were mass production machines.