"This Program Cannot Be Run in DOS Mode" Running Windows XP Setup

When you run Setup.exe in a real-mode command prompt, you may receive the following error message:

Setup.exe is not intended to be run from MS-DOS mode for Windows XP.

To run Setup from MS-DOS, you can run Winnt.exe from the I386 folder on the Windows XP CD-ROM. Type drive:\i386\winnt.exe, where drive is your CD-ROM drive, to start Setup.