Windows 7 loaded onto "D or Recovery" drive

Hi, I have a dell that came with Vista, I was given W7 for grad school and when I up graded it went to the smaller "D" or "recovery" drive and not the "C" Drive. The weird thing is that I still have the original files on the "C" drive. And now when I reload MS Office 07 it goes to the "D" drive, which alerted me to the error. How do I get the program over to "C" drive or how do I go back to Vista. Thanks

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