How do I lock out all PC activity depending on time?

Question

I'd like to enforce a curfew, say 11 PM, and stop a kid from using the PC after that, locking the user out of all activity unless a password is given until morning.

Is there some way to do this in Windows 7?

Answer 1

http://windows.microsoft.com/en-us/windows7/products/features/parental-controls

Use Windows Parental Controls, located in Control Panel.