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The NTVDM CPU has encountered an illegal instruction. CS:0dee IP:1997 OP:ff b9 07 f5 ff Choose 'Close' to terminate the application. One reason this could happen is that you are trying to run an old DOS based, or simply an old incompatible, program.The NTVDM CPU has encountered an illegal intruction. CS, 1216 IP; OP 0100; CS:0000 IP:0077 OP:f0 37 05 02 0e choose 'Close' to end the application. A CPU can only recognize certain instructions, so an instruction for one kind of CPU might not be recognized by another kind.