Failed to initialize graphics device

“Explain this to me: I get this error msg on the latest gpu/windows 10 drivers running a gtx1080 - no integrated gpu on processor. Then I tried opening exe directly and it works. Btw the game worked for days and this came up out of nowhere and for no reason after i restarted blizz launcher. Took out an old crappy unupdated for years laptop with a gtx960m garbage card and game runs just fine.”