I agree with Tedob1...

There's no need to edit the Registry manually to achieve your goal.

You can use Local Policy, use Group Policy if you're in a network/domain, and the easiest/best method is to control what Local Users exist and their system privileges (i.e. Adminstrator, User, Power User, etc.) as Tedob1 pointed out.

If you need more information re: Local Users and Groups, permissions, etc. use ww.google.com or search MS's knowledgebase.

Cheers,
<0