看看微软的专业人士解释的吧,他们犯了个错
I've located the original ISO and it doesn't match what's currently on the download center. I have burned the original to DVD and setup is working as expected so far. I believe there must have been some corruption on the download center servers.
I'm going to run setup on another machine to verify and overwrite the posted image if installation completes successfully.
http://forums.overclockers.co.uk/showthread.php?p=14212207
Problem solved - cheap and nasty flash drive must have been corrupting the image somehow when copying the image between PCs.