reinstall windows vista?

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Honorable
Jun 2, 2013
2
0
10,510
Out of the blue, I can't get on, and it says I have to reinstall windows vista. I don't want to lose my files etc--what do I do?
 

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Honorable
Jun 2, 2013
2
0
10,510


Thank you! But a CD did not come with this compaq presario; -it came with vista already on it..how would i do that? Thank you.