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Note: This is not the build that would have potentially been the Nov CTP (and was released to TAP testers)....this is an untested leak of Windows Vista. It has not passed any validation checks by Microsoft.
VERY IMPORTANT: There are possible issues with this build that *may* corrupt the boot record of existing OSes (if you Dual Boot)
This is why it is important that you install this build in a test environment if possible. If you do decide to install this and Dual boot with XP. It is possible your MBR will become corrupt.
to fix the problem, simply boot recovery console and run fixboot and fixmbr commands.