>OK, so the Clipper program was/is still working, just not with the new video adapter and "high-resolution" drivers.
>
>The main thing is to get drivers installed that are exactly correct for the make/model of video card in the computer. The best thing is to open the case and look at the installed card. Failing that you can use a hardware diagnostic program or even Windows' built-in DXDiag.
>
>Then, in Device Manager make sure the attached monitor is "Plug and Play" (preferred), or, if the monitor is old (more than 6 or 7 years or so) and doesn't support PnP then make sure the correct monitor definition file is installed so the exact make/model is reported correctly.
>
>If you do that, you should be able to run a DOS program in a window (less than full-screen size). I have seen cases where a video driver could not properly handle starting a DOS program in full-screen mode. The workaround is to start it in a window, then press Alt-Enter to switch to full screen mode after the program has started.

Al:

I want to tell you the final of the novel.

As it is Windows 7 I downloaded appropiated drivers (Windows 7 believes so) of video card and monitor. (Intel and Benq) right model.

I tried to execute command.com but nothing. NTVDM and CONHOST executes so many times I try to open DOS window but the screen keep as I do nothing.

Well. I didn't want to undo my work so I decided leave my old Clipper program and start using my new one. Thank you, DOS.

And I do thank you for your help.

Héctor