Right-click the Launchpad and click "Troubleshoot compatibility."
It opened before
An abrupt shutdown like a BSOD might've corrupted its configuration. Deleting the "Stand Launchpad" folders in your %localappdata%\Calamity,_Inc folder will reset the configuration, hopefully fixing this problem.
Injecting Stand has no effect
Click "Open Stand Folder" in the Launchpad, open the "Bin" folder, delete the Stand DLL in there, then try again.