WC3 and Windows 98


Looking for an expert here.....

I finally got my DOS starup instructions correct. But when I try to launch WC3 in MS-DOS mode, the system tells me that is has become "unstable" and reboots back to windows.

I'm running a Dell XPS T450 with a Riva TNT video card and a Montego II sound board. I'm also using a Logitech Wingman Extreme Digital plugged into the game port on the sounds board.

Can anyone out there help me out?
Just how are you accessing the game? Are you using a shortcut, a boot disk, or just hitting "restart in MS-DOS mode" from the shutdown screen?
I've tried both boot disks and using a shortcut that reboots in ms-dos mode. Same result both time.