Windows Startup Assistant
Organize your startup application with this tool. Windows Startup Assistant is a simple tool for managing your startup programs. It allows you to manage both user and machine startup items.
On Windows Vista/7, it requires admin rights to write to protected registry and folders, so will prompt you for confirmation when running. On Windows XP, you won't get a prompt but you need to be running it as an admin user to write to protected areas.
It should work on Windows XP and up. Not sure about 2000, but I think it should be ok.
You don't need to install it, just run it from wherever you want.
The license of this software is Free, you can free download and free use this startup manager software.