Help?

DOS software does not run properly.

WHen you hit Shirt-Alt-Enter, Windows should take you to a full screen
DOS mode.

I have two problems on an Evo

(1) Somes up in text mode using just the central 640x480 pixels of
the screen.
(2) When DOS uses graphics then DOS hangs at once and that is it.

Does anyone have experience of this and know if it is fixable or
whether it si a function of the Evo not implementing DOS correctly