WIN2K SP4 & DOS application

I have a machine running Windows 2000 SP4 that routinely locks up when
attempting to switch a DOS application from running full screen to running in
a window. The machine has 2.0Ghz Pentium 4, 512MB RAM and a 40GB hard drive.
The application works fine when opened in a window, but then when you switch
to full screen and try to switch back it locks up as well. This application
works fine in both a window and full screen mode on a simlarly spec'd machine
running Windows 2000 SP4 as well as one running Windows XP.

Any suggestions (other than don't switch to full screen) ??

Thanks !
.

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