I would have suggested a reinstall, but you have already done this. Have you tried using a ghosting program what will take the disk image of one pc and copy it onto another. You might want to try this. If this doesn't work then the different must be hardware.

>One machine reacting differently to messageboxes.
>All my VFP generated messageboxes are generated behind my form.
>Hence a user can't see them.
>Same application running on 25 other places but no such problem reported.
>Even in MS Word created messagebox, messagebox resides behind MS-WORD window.
>Machine formatted and reinstalled still the same problem ... Is it software related or hardware related ..... ???