answer 18 from this community created faq should solve ur issue
The problem is the application won't start up to show any error message. I have recovered from restarts before by the linked methods. But not even full uninstall and reinstall works this time. There is a work around to use another system and transfer the backup wallet file. I was thinking along the lines of a raspberry pi but the links on bit.diamond for that takes me to a slack channel or 404. I can install on another windows. Or could you suggest another system?