Hey there Bandri,
Usually this is due to this issue:
If not, try updating your drivers/windows. It may be that your GPU drivers are out of date and having a compatibility issue between diablo III and the new windows build.
If you’re still having trouble after this troubleshooting, please generate a text copy of your DxDiag using these instructions. Once you have that made, open the file. Copy the code below, then copy/paste everything from that DXDiag file between the rows of tilde (~) marks where it says “DXDiag goes here.”
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DXDiag goes here
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If the file’s too large to submit, you can upload it to a file hosting site like pastebin and post the link in the code above instead.