The NTVDM CPU illegal instruction



I am trying to run an ancient DOS program on Windows XP Pro. It used to work
fine, but now when I try to run it, my CPU usage goes to 50% and stays there,
and when I try to get output from the program I get this error:

The NTVDM CPU has encountered an illegal instruction.
CS:0000 IP:0075 OP:f0 00 f0 37 05 Choose 'Close' to terminate the application

When I click 'close' it terminates the program.

Thanks for any help.


Update: 27 Dec 2007 10:39

I just tried running the program is safe mode. The program runs flawlessly
if I am logged in as 'administrator' but not when I am logged in as myself -
and I am the administrator.

Looking in the task manager, all the processes running are the exact same
weather logged in as administrator or as myself, but I get the same error
when I try to run it as myself either in safe mode or normal mode.

Also, one other thing - the window is square and rather small with a black
section at the bottom when logged in as myself, and normal size, rectangular,
when logged in as admin. when it works right - both in safe mode

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