Office 2010 will certainly run on Win 7, whether the OS is running in 32-bit or 64-bit mode.


If the OS is running in 32-bit mode, you can only run applications in 32-bit mode.
If the OS is running in 64-bit mode, you can run applications in either 32-bit or 64-bit mode.
MS advises that you need only use the 64-bit version of Office 2010 for large Excel worksheets & Access databases.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]