Hi belalgamal46,
Try the steps in the section of the troubleshooting guide posted below. If nothing works, we will need a little more info to help track down the problem.
dxdiag (system specs):
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Windows: Go to the Start menu and type ‘dxdiag’ into the search bar. Open that file and then click ‘Save All Information’. Post that text file here.
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Mac: Go to the Apple menu and click ‘About This Mac’.
Debug Logs:
Follow the directions in this section to generate your Debug Logs and post them here.
I’m sorry if you received multiple email responses, the website wouldn’t allow me to add the links like it should.