Look for the XP serial number (key) located on the back or side of the computer. If you have the key, just re-install XP.
Also more RAM will always speed up XP, current RAM is very cheap. As it gets older and obsolete, price goes up.
If you don't want to re-install you'll need to run several cleanup programs.
Also if you're kid will be online with it make sure you have a current anti-virus and firewall program installed.
Free apps and utilities.
AVG Free - Download antivirus and antispyware software for Windows XP and Vista http://www.zonealarm.com/store/conte...e_firewall.jsp CCleaner - Home The home of Spybot-S&D!
Tweak XP configuration
Black Viper's Web Site