What google finds for me:
- http://answers.yahoo.com/question/index?qid=20080128032635AAY7OQk says you can't
- http://creafilgo.blogspot.com/2008/03/how-tos-remove-folder-lock-without.html tells a possible way. Using it, of course, is at your own risk. Not mine!
Kees
How do I uninstall folder lock if I've lost my password?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic