You can use Free Crawler Parental Control&Web Security Guard. It offers:

- Prevent your kids from accessing potentially harmful websites
- Restrict access to selected programs and folders on your computer
- Set limits on time spent at your computer and online activity
- Don't allow your kids to install malware or change important settings
- Receive reports about selected activity on your computer
- Web Security Guard displays website reviews and threat level to help prevent your kids from entering potentially dangerous websites.

You can download it from here.