MCreator issue tracker has been migrated to GitHub.
Existing tickets have been migrated to GitHub. Please open new tickets on the GitHub tracker instead. If you do not have a GitHub account, all feature requests and bug reports from forums are still considered and checked by the maintainers.
Try running it using MCreator.bat as you are on Windows and report back if it worked. Make sure you don't have any Antivirus that could be blocking MCreator too.