If you experience crashes, blue or black screens, performance issues, or your computer locks up while playing, follow the steps below to resolve these issues.
Troubleshooting steps for Diablo II (2000) performance issues
Troubleshooting steps to help you connect to StarCraft II
This warning displays if you don't have enough available memory on your system to use your current settings.
Black Screen when starting StarCraft II.
The video cards supported for use with StarCraft® II