So Im just about to buy the Windows 7 Student Upgrade online because it's a better price. I recently built my comp and installed Windows 7 OS with an already used disk so now alot of the features have dropped off and its running kind of funky because I dont have the CD key. I didnt know if I should wait for Windows 8 or just buy the upgrade to W7 Professional and run it. Also, is it worth it to buy the backup disk from the Microsoft website ($14.95) or is it something I can just burn myself from the download? Any advice would be appreciated!!