DOS 6

You may, but you will have to reformat the hard drive to FAT32 (or maybe even FAT16) as DOS does not recognize the NTFS formatting that is used by Windows XP.   You can then install DOS (but no guarantee that the hardware will be compatible since it's designed to the Windows XP specs and there are no drivers for DOS for many devices) and Windows XP as a Dual boot.

One option to run MS-DOS 6 or other historical OS version in a modern computer, is to use Microsoft's Virtual PC software which allows running almost any OS in a virtual PC.