Hello Greg,
Apple's magic mouse will not work With Windows 7 or for that matter any Windows Operating System. It is specifically built for Mac users and not Windows users.
The system requirement for Apple's magic mouse has been discussed in Apple's website
System Requirements
* Mac computer with Bluetooth wireless technology
* Mac OS X v10.5.8 or later with Wireless Mouse Software Update 1.0* or Mac OS X v10.6.1 or later with Wireless Mouse Software Update 1.0
* Existing keyboard and mouse for setup
* Two AA batteries (included)
For more information on Apple's magic mouse visit the following website :http://www.apple.com/magicmouse/
Azeez Nadeem - Microsoft Support