Error 0xC004D401 (Activation) Plase Help

Every time appears the mensage


"There is a problem with your license so notifications will no longer appear"
You will no longer recive notifications, including those about your license
or activation.
Try to fix this problem, click one of the links below.
Error: 0xC004D401
Description:
The security processor reported a system file mismatch error.

I tried to validate, but every time appear "Error on Windows validation"
Unricognized error.

I tried to change my key but when i do it, appear one new window caled
"Invalid product key"
Code: 0xC004F033
Description: The Software Licensing Service reported that the product key is
not allowed to be installed. Please see the eventlog for details.
I've the original key ...
I don't know what i have to do now to stop it, can you help me ?

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Thank you.