And - unless you are completely literate in the registry - leave it alone in the future. Leave the time-outs alone, leave the page file alone after you set it up properly as recommended by Microsoft -1 1/2 times the amount of installed ram, in fact, leave all the settings you mentioned alone. You couldn't even remember what you did!
You can completely hose your system making alterations or changes in the registry that are improper. There is a reason the Microsoft engineers set them up the way they did in the first place!
The same goes for using third party registry programs. Don't use anything that alters or changes the registry unless you know exactly what you are letting them do and can reverse deleterious effects that may occur because of registry changes.
The ONLY safe ap that does impact the registry is the Windows One Care Free Scan (because it was designed by Microsoft specifically for your op system!)
Go to Windows Live Onecare Free Scan (using Windows Explorer only)
It will say "Get a free PC safety scan"http://safety.live.com/site/en-us/default.htm
Make sure you click "Full Service Scan"
in the middle of the page and not the "Try It Now Free" on the right side.
Allow it to download the Active X components.
Choose "Complete Scan" in the window that opens
Do not click on anything else that offers you a free trial or to sign up if you live in the US.
Allow it to scan - it may take quite, maybe two hours or so depending on how big your hard drive is and how fragmented your registry and drive are.
If you choose to ignore the advice above make sure you have everything you will need to format your hard drive and reinstall XP (like your Windows XP Installation cd, its 25 digit unique key code and all the drivers for the equipment on your PC, and the knowledge of how to accomplish it properly, because you will eventually need to do so by changing the way in which your op system was designed to operate by the experts who designed it.