Ok so my computer had so many trojan viruses and spyware so my friend said I should reformat my computer, so I did and now I'm installing win xp pro edition again, then it asked for my product key under my Certificate of Autheniticity but I looked at it and it said:
You are required to affix this Certificate of Autheniticity to the exterior of the PC
it didn't have the 25 digit product key

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so now all I can do is restart the computer and it will install windows xp pro again untill it gets to the product key prompt.
Does anybody have any ideas of what I should do?