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Dual Booting with MS-DOS
(and Windows 3.x)

If you already have MS-DOS installed, it's a simple matter to
install Windows 2000 for dual booting. From the MS-DOS prompt
(or from Windows 3.x), run \I386 \Winnt.exe (not Winnt32.exe) to
start the Setup program. That's it.
Because MS-DOS (and even Windows 3.x, as long as you don't
install Windows 2000 to the \Windows folder) doesn't share any
folders with Windows 2000, the two operating systems can safely
coexist on the same partition. This is the one exception to the
limitations described earlier. Even in this case, however, you might
want to consider separate partitions for MS-DOS and Windows
2000. Why? If you plan to upgrade your MS-DOS or Windows 3.x
to Windows 9x, it will then need to be on a separate partition.

Installing MS-DOS After Windows 2000
Is Installed

Adding MS-DOS to a system that's already running Windows
2000 is much trickier - and generally not worth the effort. You'll
need to install MS-DOS (by using its setup program) or use the
Sys command from an MS-DOS boot floppy disk. Either way,
you'll wipe out the Windows 2000 boot sector - and, possibly, the
master boot record - which you'll then need to restore. Then you'll
also need to edit Boot.ini to add this line to the [operating systems]
section:
C:\="MS-DOS"

Using Other Ways to Boot to MS-DOS

If you have installed Windows 9x to dual boot with Windows
2000, you can use the Windows 9x dual boot capability to launch
MS-DOS. When the Windows 2000 boot menu appears, select
Windows 95 or Windows 98 and press Enter. Then press F4 to
boot into MS-DOS. (As an alternative to F4, you can press F8 to
display the Windows 9x startup menu. Then select Previous