Control those pesky kids by using parental control. Total control over their PC usage! 
To turn on Parental Controls for a standard user account (Must use a standard user account)
Open Parental Controls by clicking the Start button, click Control Panel, and then, under User Accounts, click Set up Parental Controls. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Click the standard user account for which you want to set Parental Controls.
Under Parental Controls, click On.
Once you've turned on Parental Controls for your child's standard user account, you can adjust the individual settings that you want to control. You can control the following areas:
Web restrictions. You can restrict the websites that children can visit, make sure children only visit age-appropriate websites, indicate whether you want to allow file downloads, and set up which content you want the content filters to block and allow. You can also block or allow specific websites
Time limits. You can set time limits to control when children are allowed to log on to the computer. Time limits prevent children from logging on during the specified hours and, if they are already logged on, they will be automatically logged off. You can set different logon hours for every day of the week
Games. You can control access to games, choose an age rating level, choose the types of content you want to block, and decide whether you want to allow or block unrated or specific games.
Allow or block specific programs. You can prevent children from running programs that you don't want them to run.
Set up Parental Controls activity reports
Open Parental Controls by clicking the Start button, click Control Panel, and then, under User Accounts, click Set up Parental Controls. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Click the account that you want to turn on activity reporting for.
Under Parental Controls, click On.
Under Activity Reporting, click On, collect information about computer usage.
To view activity reports
Open Parental Controls by clicking the Start button, click Control Panel, and then, under User Accounts, clicking Set up Parental Controls. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Click the account that you want to view activity reports for.
Click View activity reports.