How to check if graphics card is working or not?

Dec 9, 2013
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I have a HP Pavilion G6-2233TX. It was working nicely until I upgraded to windows 8.1. After the upgrade XBMC media center which used to run super smooth in windows 8 now shows "Cannot create GUI". So I want to know if my graphics card is functioning properly or not. Please do tell me how to do it.

P.S. After the upgrade my Bluetooth also stopped working.

Thank You.