I am the Administrator. I would like to restrict computer access to all users.

Would like to make use of all the following options:
- unable for non-administrators to turn on the computer between 10PM and 6AM.
- unable for non-administrators to access internet.
- non-adminstrators able to access internet but not Instant Messenger.

What are my best options to control my 13 year old?

Thanks for any assistance you can offer.

G