Question i updated my nvidia gpu and my pc says it says it is a unknown device

Apr 8, 2020
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so i updated my gpu (gtx 960) and was playing and out of the blue my pc crashed i got it back on and i tried to play a game and noticed my frames were one so i checked my cpu in device manager and it just dissapeared then i realised it says it as a unknown device so what do i do? can anyone help thanks in advance!
 

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