need help

Start up of what? Windows? What version? What is a "moitor"? What does "keep at 840" mean? keep what at 840? You are not making sense.

In true Microsoft style, this is what MSDN had to say about your problem:

Error Message:

The NTVDM CPU has encountered an illegal instruction.
User Action:

Retry the operation. If you still get this message, try to continue. If you are able to continue, you might want to check the results of the running application. Otherwise, terminate the application, then restart it. If you still get this message, contact your technical support group or the supplier of the running application.


...hmm!

this is what a NTVDM is....

he focal point of VM capability in Windows NT is NTVDM.EXE from the SYSTEM32 directory. Each running instance of NTVDM.EXE constitutes a separate VM. NTVDM.EXE is a Win32® program. However, it uses its separate address space to create a VM that runs alongside regular Win32 processes. In other words, programs for MS-DOS and 16-bit Windows are like children belonging to the adult NTVDM process. NTVDM is just another adult Win32 process, with essentially the same rights and privileges as any other Win32-based program. This architecture even has its own name, Windows On Windows (WOW).

here (http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0898/hood0898.htm&nav=/msj/0898/newnav.htm).