(WinXP Pro) Use the Ultimate Configuration Tool

[jadison]

One of the most full-featured Windows XP configuration tools available is hidden right there in your system, but most people don't even know it exists. It's called the Local Group Policy Editor, or gpedit for short. To invoke this editor, select Start and then Run, then type the following:
gpedit.msc, and hit ENTER.

Now you'll be greeted by gpedit, which lets you modify virtually every feature in Windows XP Pro without having to resort to regedit.

[Google]