Press WindowsKey + F to bring up the search menu and search for "partition". Click on the settings tab and open up device manager.
Only one result should popup, now you can right click on a drive and select "shrink volume". this way you can make a new parition to install Windows7.
Regards,
Dylan Meeus
0x2B |~ 0x2B Blog : www.it-ca.net/blogdylan