I have reports of problems when people try to run install on Windows Vista x64 SP1 final build available from MSDN.
The installer reports following error when run:
The version of this file is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need an x86 (32-bit) or x64 (64-bit) version of the program, and then contact software publisher.
Advanced Installer used is 6.1.1. Running same install on Windows Vista x64 does not yield this message and installer runs correctly.