Many problems with VLC are due to wrong settings or broken cache. You can solve these through deleting VLC's preferences and cache.
If you installed VLC properly you can delete the preferences and cache by simply opening the shortcut you can find in your start menu: All programs > VideoLAN > Reset VLC media player preferences and cache files
Deleting the files manually
Open the explorer and type %APPDATA% into the address bar and hit enter. This should lead you to the AppData folder of your user. Therein you should find a folder named vlc. Delete that folder and your done.