Some overlay programs can cause Blizzard games to crash.
Troubleshooting steps for Diablo II crash errors
Troubleshooting steps for if Warcraft II crashes when trying to start the game.
Information regarding crashes accompanied by a Blue Screen
Troubleshooting for game crashes with error "The application encountered an unexpected error"
Troubleshooting steps for IGR owners who have partnership with Blizzard on commonly encountered issues.
Information on what to do if you receive an error message saying you are online with your own key in Diablo 2.
How to reset in-game options
How to obtain error logs for Blizzard games
How to disable the Game DVR and Game Bar in Windows 10