An upgrade to XP Pro is a one-way ticket with no uninstall option.
Backup your important files and documents to a CD, then perform a
"clean install" of Windows 2000:
The Windows 2000 CD is bootable and contains all the tools necessary
to partition and format your drive. Follow this procedure and allow
Windows 2000 to partition and format your drive:
NOTE: It would be best to physically disconnect all your peripheral hardware
devices, except for you mouse and keyboard, before installing W2K.
1. Open your BIOS and set your CD Drive as the first bootable device.
===> Accessing Motherboard BIOS
===>
http://www.michaelstevenstech.com/bios_manufacturer.htm
2. Insert your Windows 2000 CD in the CD Drive and reboot your computer.
3. You'll see a message to boot to the CD....follow the instructions.
4. The setup menu will appear and you should elect to delete the existing
Windows partitions, then create a new partition, then format the primary
partition (preferably NTFS) and proceed to install Windows 2000.
5. After Windows 2000 is installed, visit the Windows Update website
and download the available "Critical Updates".
6. After installing the critical updates, be sure and visit the support website
of the manufacturer of the computer to download and install any
available Windows 2000 compatible drivers, such as video adapter
and audio drivers.
--
Carey Frisch
Microsoft MVP
Windows XP - Shell/User
Be Smart! Protect your PC!
http://www.microsoft.com/security/protect/