You can keep track of your kids' PC use with Parental Controls—watch this video to see how. (0:54)
In Windows 7 you can set limits on your kids' computer use—and help them be safer online—without constantly peeking over their shoulders.
Parental Controls helps you limit how much computer time children have, as well as which programs and games they can use (and perhaps more importantly, when). With the Parental Controls in Windows Media Center, you can also block access to objectionable TV shows and movies.
To help keep your children safer online, download Windows Live Family Safety. This free program helps you manage which websites your children see and who they can talk to online. It also provides helpful, easy-to-read reports of their online activity.