Run the Disck Cleanup and Disk Defragmenter tools to clean up and optimize your hard drive before passing it down the line. Why should kids deal with your mess?
Even with parental-control software, it's a good idea to boost your browser's security. Open the Internet Options control panel and raise the slider just a notch.
Install and run a parental-control application, such as the popular Net Nanny. It will allow you to limit the time your kids spend online and ensure the they access only appropriate sites.