Uninstall and erase the settings, it's a check box you can clik during the uninstall process. Nothing special Nano, just launch the uninstall shortcut in the VLC menu in the start system*** and during the uninstall it ask you what do you want to remove, you click everything and lets go.
I had to dig into some VLC download mirror to find an old version if you can't find it yourself just ask, and i'll sneak in again
*** (sorry i'm french I don't know right now how to translate that, it's 07h in the morning and I just woke up :p )