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Here is another good resource for comparing 32-bit and 64-bit - http://windows.microsoft.com/en-us/windows7/32-bit-and-64-bit-Windows-frequently-asked-questions
Additionally, if you have questions on any of your specific games working with 64-bit Windows 7, you can visit the Windows 7 Compatibilty Center, and type in the name of the game. This will tell you if your game is compatible with Windows 7 (32-bit, or 64-bit) - http://www.microsoft.com/windows/compatibility/windows-7/en-us/default.aspx
Cheers,
Cassandra
Microsoft Windows Outreach