At some point you must have set VLC Media player to open just a bit too many things. Use a restore point and go back to a time before the issue started, if it works. A lot of time Restore Points don't do anything to help.
It's also helpfull to say when this started, what you tried already, etc...
After about 4-5 posts people end up saying "well, I re-installed Windows over itself 3 times because I deleted some random files and had 34 viruses and I also spilled Coke on the hard-drive", usually after someone spends an hour researching the issue.
A good way is to move all the settings to the original setting. Uninstall the program and reinstall.
Or you can try to use FreeSmith video player. The point I like it is that as a freeware, it is without any ad, spy, user tracking, limitation.