Hi anas_ali,
Could you post your 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’.
Also, follow the directions in this section of the troubleshooting guide to generate your Debug Logs, then post them here as well.