This issue is not supported by Blizzard Customer Service as it is not caused by a Blizzard product. Blue screen crashes indicate a critical system error has occurred. These will only happen on Windows systems, and sometimes indicate a corrupted operating system or failing hardware.
For BLZ errors such as BLZOWCLI00000004 click on the error code or search for the specific error code on the support site.
For "unexpected error" codes visit our article "The application encountered an unexpected error".
Check the BlizzardCS Twitter for any service interruptions and pick the appropriate link below: