You have a DOS prompt running in version 5.1.2600 of Windows XP. The version
of DOS you are talking about is the old version pre windows. You cannot
upgrade.
XP has *no* DOS at all. It has provision for running well behaved DOS
programs under emulation in a 32 bit sub-system. For that you normally
use cmd.exe as a command interpreter, which behaves like a DOS 6.2 with
modifications. There is also a command.com which can be run, and is
genuine 16 bit DOS 5 code - this will be what you see. VER always
reports "Windows version 5. . ." not a DOS version at all. There is no
way to run a DOS 6 command.com. If you need to, boot a real DOS boot
floppy or WIn98 startup one. But if it is merely a matter of some
program not liking the VER report, use
SETVER progname 6.22
in the Command Prompt.
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