It's been a long time since I looked at DropMyRights, a little tool I wrote forever ago to lower a user's privilege level on versions of WIndows prior to Windows Vista. Michael Horowitz has just posted a couple of blog posts about DMR stating that everyone on Windows XP should use the tool. The articles are at http://blogs.cnet.com/8301-13554_1-9756656-33.html and http://blogs.cnet.com/8301-13554_1-9758770-33.html.

Remember, this tool is not needed on Windows Vista or Windows Server 2008, because by default users are not administrators.