Win 7 Install Question.

Forgive my ignorance, but the last time I upgraded my PC OS was Win XP to Vista (still running it now). My question is this - I'm running Vista 64 bit, and want to install Win 7 64 bit - will I need to format my drive, or can I just 'overlay' the Win 7 installation, and will it install leaving all my files (games, programs, etc) intact, while removing all the Vista files?



Thanks for any help, in advance!

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