WinForcer - description from Softdepia.com:
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.
All the items are configurable through the WinForce Config Application and changes to your configuration are implemented immediately without the need to restart Winforcer or log off.
You can WinForce any application or Folder through WinForcer Administrators can suspend WinForcer to regain access to the users desktop without having to log out.
You can configure multiple machines by using distribution configuration files. So you do not need to individually set up each machines config.
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).
WinForcer is a "Free to try" program. You can download and try it for an evaluation period.