This program will change the operating system type on your computer.

You can turn a Windows NT Workstation (or a Windows 2000 Professional)
installation into a Server environment and vice versa.

While the software has been tested on NT4 and Windows 2000 installations,
there are no guarantees that it will work on your system. USE AT YOUR
OWN RISK!

The software also appears to turn Windows XP Professional into "Windows
Whistler Server", but the resulting operating system is not fully
functional. DO NOT USE THIS PROGRAM ON WINDOWS XP UNLESS YOU ARE WILLING
TO REINSTALL THE OPERATING SYSTEM.

REASON: It's a well-known fact that Microsoft's Windows Workstation and
Windows Server products share the same binaries - the only difference
lies in the registry. The sole reason for the creation of this software
is to demonstrate this fact to the public.

ran the ntswitch and changed windows server 2003 successfully into windows xp professional.
restarted, and it came up with the windows xp professional boot screen!
when u go to About Windows, it says Windows XP Professional (NT version 5.2 build 3790)!
i wonder how windows server 2003 contains images of windows xp professional?
well i installed norton antivirus 2003 professional with no trouble.