Application popup: 16 bit MS-DOS Subsystem : C:\windows\system32\cmd.exe
NTVDM has encountered a System Error
The parameter is incorrect.
Choose 'Close' to terminate the application.
I need help as this happens during fast switch(ALT + TAB). is there a registry fix, or does the NTVDM need to be reinstalled? out of 20 Machines with running Win7 32bit, this is the only one to fail. just a footnote, the graphics driver is disabled to allow CMD full screen access when needed.