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Entered new product key and did not change

Last response: in Windows 7
January 23, 2013 8:28:00 PM

I have tried to enter the product key. What happens is that i enter the 25 digit key and the 20 digit existing key is still there. When i try to open excel it only allows me to enter 24, wont enter the 25th digit. When i try to enter the existing key it does not take the "zero" digit. Can you help?
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