What's a 16bit MS DOS Subsystem?

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I'm getting a error also.. 16 bit MS-DOS Subsystem...C:\WINDOWS\system32\wuaudt.exe
The NTVDM CPU has encountered an illegal instruction.
CS:0551 IP:0108 OP:0f 00 00 00 d0
Says to choose 'Close' to terminate the application. Neither close or ignore seem to work. Hope you can help.

i get a error saying this system does not support full screen mode

16 bit MS-DOS Subsystem
Turbo C++ IDE The NTVDM CPU has encountered an illegal instruction. CS:c000 IP:2c40 OP:8f 96 b9 0e ff Choose 'Close' to terminate the application

16 bit MS DOS Subsystem
C:\Users|THECHA~1\AppData\Local\Temp|`tmpa.exe

This message pops up quite often while doing anything on the computer. Not just at start up. It popped up twice while doing this.

16 bit MS DOS Subsystem
C:\Users|THECHA~1\AppData\Local\Temp|`tmpa.exe
i cannot fix this problem

mine says this system does not support fullscreen mode too.
how do i fix it?

16 bit MS-DOS Subsystem
Turbo C++ IDE The NTVDM CPU has encountered an illegal instruction. CS: 0060 IP: 0075 OP: f000fo 3705 Choose 'Close' to terminate the application

I click on a .DO1 file and receive a 16 bit ms-dos
subsystem message: C:\DOCUME~1\owner\MYDOC~1\
SHORTC~1.PIF Close to terminate.
Any help appreciated.

16 bit MS-DOS Subsystem
C:\windows\system32\2.exe
The NTVDM CPU has encounted an illegal instruction
CS:0da4 IP:0112 Op:62 c2 c0 45 bd 41

16 bit MS-DOS Subsystem
C:\windows\system32\mdm32.exe
The NTVDM CPU has encounted an illegal instruction
CS:0545 IP:0261 Op:64 63 2E 79 76

Also try to run apps -like run-open-___ ok a black box pop up on top c:\windows\system32mdm32.exe rest of box M T .

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