This is an old Microsoft wireless hardware and no native W7 drivers exist.
To make it work:
Download the software if you lost you cd, http://go.microsoft.com/fwlink/?LinkId=33104
Run the extraction wizard and select an extraction file you can find like the desktop. The wizard will fail to complete because it doesn't detect XP. Well find where it unziped the files to and run the setup.exe in XP compatibility mode (properties -> compt. tab)
Should work, however it requires the MS Broadband networking utility to be running. Just ignore it, hide it in tray and use windows 7 built in wireless.