You think you've got DOS problems on XP,I have them & I'm running Windows 98!!
Upgraded to a newer Intel 815EP based Asus M/B & gradually been upgrading components. I Uninstalled my old Soundblaster PCI64 card,only to discover that not all the SB64 programs uninstalled themselves. I replaced it with a Soundblaster Live DE5.1 & unlike the SB64 card,the legacy driver worked on this M/B but for some bizzare reason,I now cannot enter into a pure MS-DOS mode!