The Boot Camp Software Update 3.1, which comes in two different flavors: one for 32-bit Windows and one for the 64-bit versions. 
Both of the updates deliver support for the Home Premium, Professional, & Ultimate versions of Windows 7.
Other changes with the Bootcamp update include fixes for the trackpad, along with support for the Apple wireless keyboard and Magic Mouse.
Download links below:
Boot Camp Utility for Windows 7 Upgrade
Boot Camp Software Update 3.1 for Windows 32 bit
Boot Camp Software Update 3.1 for Windows 64 bit
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