Howdy Heartstock,
This sounds like the app is either corrupt or it’s picking up the onboard graphics card. I would look into updating the onboard card (Most likely intel) and reinstalling the app fully.
Sometimes the app files corrupt so badly the only fix is to reinstall the app, which requires some files to be deleted. This can solve a whole host of issue with the app, including the issues it’s currently having. Thankfully the app is fairly small so it won’t take long to reinstall.
· Press the Windows Key+R on keyboard
· Type %ProgramData%
· Hit enter
· Delete Blizzard Entertainment and Battle.net Folders
· Empty Recycle Bin
· Uninstall and reinstall the app, please reinstall onto the C drive