Will windows 7 automatically replace the windows vista files when i format my laptop?

i want to format my laptop containing windows vista into windows 7 .....but i have in (C:) really important files and i heared that when formatting using windows 7 it makes a file called windows.old at the same time i want to completely remove the windows vista files and install instead windows 7 files anyone can... show more i want to format my laptop containing windows vista into windows 7 .....but i have in (C:) really important files and i heared that when formatting using windows 7 it makes a file called windows.old at the same time i want to completely remove the windows vista files and install instead windows 7 files anyone can help me do this...thanx
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