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my microsoft validation product key wont work?

my son has borrowed my computer now i cant access windows it asks me to enter my product key which i have it comes up invalid
baggieite, December 2008
re download your windows

Leah, January 2009
contact Microsoft...

http://support.microsoft.com/gp/contactathome

Micki, December 2008
link Click here to see other fixes for Microsoft.