I would actually try it here and get back to you but all I have is the 32-Bit version of Windows 7. It might be something to do with the fact it's the 64-Bit version and it's causing issues since the proper drivers are not available. I will do some googling and get back to you.
See if this helps.
Gizmodo - How To Install Windows 7 On Your Mac Using Boot Camp - Windows 7 boot camp