Lainaus:

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Here?s how to fix KB974431 installation failure due to 0xC004F050 error:

1. Run command prompt
window as administrator.
2. Run the following command to reset all system files to default and clean the system from hack or crack:

sfc /scannow
3. If activation grace period has expired (e.g. black background desktop), run the following command to rearm Windows to extend activation grace period for another 30 days (i.e. genuine for another 30 days):

slmgr /rearm
4. Restart the computer.
5. Run Windows Update to install KB974431 update again.
6. If Windows loses activated status, perform activation again.

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