WinForcer
Prevent unauthorised users from running any Windows application you specify. Block the desktop, Start button, Control Panel, Hide Drives or block individual folders. WinForcer is fully user configurable and supports different settings for each user or global blocking. ... Can be configured not to WinForce the Administrator User or prompt anyone logged in as administrator for the password thus ensuring you will not forget the password. ... (WinForcer assumes that the network admin password is secure).
http://www.winforcer.com/wfme9x.exe - 2Mb - Download - Screenshot