Windows 8.1 - Play fifa 13 with windows 8.1

Hi there,
I have a problem with Windows 8.1. Every time I turn on my PC appears a blue display which says that I have to activate windows 8.1. The problem is that I don't have a Product Key with 25 digits, only one with 20. 
If I want to play fifa 13 it doesn't works so I decided to desinstall win 8.1.
And if I want to desinsall windows 8.1 I need the product key.

I don't know what to do, please help me!

Fabian Becker

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