DOS Program suddenly stops in XP

[FSD_KY]

Hi. I have a very properitary DOS accounting program that's used for Agriculture. I've been running it in XP Pro for nearly a year with no problems. I have to keep an old parallel connection HP 600 Deskjet printer because it will only work with the LPT1 port on non-Windows printers. The program opens with a .bat file and a few days ago it suddenly stopped running. It will open the program and go the front screen and then disappear. Occasionally it flashes a DOS screen that says it has a problem with a file in the program. The screen stays up from 1-5 seconds randomly. The weird thing is I've copied the program directory to 2 other XP machines and it will run. Has something in Windows corrupted? Nothing in the setup of the first machine has changed. Thanks for any help you can give.

[Statica]

Its kinda difficult to figure out what the issue is without the actual program name (which might not help us much if it is extremely proprietary .. but I hope you've done a Google search for it anyway) or without the error message (have you checked your System events for any error logs?
Check out: http://support.microsoft.com/default...;en-us;Q314452 or http://www.digital-documents.co.uk/a...chi_cd_fix.htm

[FSD_KY]

Sorry for being sketchy but I've never found anything on the program by searching the net. The program is MMAP. This is the .bat file it starts with:

ECHO OFF
FBOMEM > FBWMEM
IF /%1 == /NEW GOTO NEWFARM
IF /%1 == /new GOTO NEWFARM
GOTO NOTNEW
:NEWFARM
DEL FBW*.*
DEL FBF*.DAT
COPY FBFPRS.SAV FBFPRS.DAT > NUL
COPY FBFCRP.SAV FBFCRP.DAT > NUL
REM SHOULD FBFDES.SAV BE CHANGED OR LEFT ALONE 3-11-92
:NOTNEW
IF EXIST FBFPRS.DAT DEL FBFPRS.DAT
IF EXIST FBFPRT.DAT DEL FBFPRT.DAT
IF EXIST FBWCKI2.DAT DEL FBWCKI2.DAT
IF EXIST FBFLBL.LBL DEL FBFLBL.LBL
IF /%1 == /NEW GOTO SW6-OFF
IF /%1 == /new GOTO SW6-OFF
GOTO SW6-ON
:SW6-OFF
FBOMEN (-6)
GOTO CHECKBAT
:SW6-ON
FBOMEN (+6)
:CHECKBAT
IF EXIST FBWDM4 GOTO END
IF EXIST FBWCKL.BAT GOTO RUNBAT
GOTO END
:RUNBAT
FBWCKL
:END
IF EXIST FBW*. DEL FBW*.
IF EXIST FBWCKL.BAT DEL FBWCKL.BAT


The error I receive is:

C:\MMAP>ECHO OFF
Error Accessing File : FBWMEM
FBOMEM Segment RT : Error 146 at COBOL PC 148A
Press any key to Continue......