There is a program for all the Windows family including NT/2k and XP, called Secure Desktop.

It does all, and, more of exactly the keystrokes you wish to disable at the registry level.

I've no idea [except maybe certain websitez] where you can get it from, but this url is the program spec website: http://visualautomation.com/comprod/...6/secure_d.htm

Take a look, it might be what you need....

Sorry, don't mean to sound like an advertising agency! Just used the program, and it's pretty cool!