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Posted on Feb 10, 2009
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Windows problem I have a system program compiled in clipper that i need to run in Vista OS, I already set the Files & Buffer at the config.nt but still there is an error. The error is.. 16 bit MS-DOS Subsystem... H:\ip\MRK1.EXE The NTVDM CPU has encountered an illegal instruction. CS:20d9 IP:c411 OP:fe268907 5e Choose 'Close' to terminate the application. Please i need help for my program to run and work properly. Thanks & Godspeed

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  • Expert 56 Answers
  • Posted on Feb 13, 2009
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I would say the easiest thing to do with legacy programs is to run a virtualized version of an older windows OS within Vista.

Visit VMWare Server to download their free product that can run in Vista. You can then "find" a windows 98 cd-rom image to install with. It is fairly easy, but there will be a little work getting Win98 running.

This is probably the best way since you don't have to worry about compatibility with Vista, and also if the legacy app crashes it only crashes your VM and not your whole system.

If you would like some more in-depth discussion about virtualization, just email me.

  • Anonymous Mar 21, 2011

    Try to add config.sys and autoexec.bat commands in config.nt file (folder windows/system32). I have had a lot of these problems, but a new shortcut to cmd.exe solved almost all of them.
    DOS program does not work under 64 bit OS. Try TameDos to run Clipper programs.

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