If you want to limit your child’s computer time, Windows Vista has a great tool built in that will stop them dead in their tracks. From the control panel, you are able to create a whole schedule that only allows specific users access to their account when you specify. When logged in, the user will get a 15 and 1 minute warning before they are automatically logged off. There is a whole bunch of other parental controls that includes collecting information about the usage of the user and what games they can play. If you have a problem with your child and computer usage, look into turning on the parental controls.