Some users have bumped into installation errors with the latest flavor of Windows 8. Microsoft says you may need to tweak or update your BIOS to solve the issue.
Have any of you tried to install the new Windows 8 Release Preview only to face the message: "Your PC's CPU isn't compatible with Windows 8."
If so, the solution to the problem may lie in your computer's BIOS.
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What to do if Windows 8 Release Preview won't install | Microsoft - CNET News