The NTVDM CPU has encourted an illegal instruction

16 bit MS-DOS Subsystem.

C:/DOCUME~1\username\LOCALS~1\Temp\variousfilename.tmp

The NTVDM CPU has encountered an illegal instruction.

CS:c5da IP: ebd9 08 00 00 00 Chose Close to terminate the application
-------------------------------------------------------------------------

This error pops up randomly on the machine.

Resolution:
Run a repair of Microsoft Office

go to Add/Remove Programs
click on Microsoft Office
choose the Repair option