>>>this is thirst time i meet this message on a computer.
>>>why this message ? how to correct it ?
>>Hrm... Hadn't seen that message in ages -- used to be a common message back in the Win16 days (back then the solution was to edit the CONFIG.SYS to extend the number of DOS system file handles from the default -- most of the times folks simply put FILES=255 to simply "max out" that setting)... You might still see similar problem if you're running 16-bit apps -- the solution would probably be similar (can't remember what the filename is for the NTVDM however).
>
>config.nt

Oooh... that brings some weird memories... from NT4.0, IIRC. It took me a long time to find out that you could, actually should, have a local config.nt (and maybe also autoexec.nt) for each folder where you want to run an exe, so you could have various settings, and have fun adjusting each. And get lost in them, eventually.