Have you checked out the sticky threads for known issues? Maybe it’s this one:
Otherwise, please provide a DxDiag. Thank you.
DxDiag instructions (click to expand/collapse)
Press Windows Key + R.
Type DxDiag and press Enter.
In the DxDiag window, click Save All Information.
Name the file “dxdiag” and click Save.
To add it to your reply here:
Open the text file and copy all of the text.
Paste the text in your reply.
Highlight the pasted text and click </> on the post editor.
Note: If your DxDiag does not fit in one message, you can break it up into two posts, or (preferably) post it on Pastebin and provide the hash code (the random numbers/letters after the .com) in your reply.
Note: I’m an MVP/volunteer, and I don’t work at Blizzard.