ive got a compaq presario c300 it had xp but i had it upgraded to vista home premium and its not working right i want to format it and reinstall vista i only have the product key can you tell me how to do it thank you
Just having the product key is no good. You will have to buy a Windows Vista installation disc from a computer software store. If you are referring to the product key that's printed on a sticker underneath your laptop, that's for Windows XP only. You can't use it for Windows Vista.
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