I currently run WinXP from a C partition that is 15GB in size (D uses the rest of the 640GB drive). I'd like to do a clean install of Win7 Ultimate in the C partition. Can it be done, do you think there's enough room? Are there any options to choose NOT to install items (to save space) during the install? Will I risk corrupting the D drive which has all my data (personal data, music & videos)?