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Error when trying to install Windows 8.1 "CompareExchange128"

FFX

Active Member
This is driving me nuts, every time I try to install the update I get this error. I ran CoreInfo to see if my CPU supports PAE, NX and SSE2, as these are the requirement for Windows 8.1, and everything is supported! How can I fix this?
Supported.jpg.
 
Anyone else who has encountered this problem? Information for fixing this, is really scarce. And over at answers.microsoft.com they haven't answered yet.
 
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