A bit more info. Looking through "running tasks" in sys info revealed multiple copies of CMD.EXE were actually running, I just can't see the window!
Can you see the CMD.EXE application in Application tab of Task Manager or is it visible only in Processes?
If it is available in Applications tab also, then the window might be hidden beyond the resolution range. Try this,
Press ALT+SPACE -> M and then press any arrow key. The window border will be visible and you will be able to move the window with the mouse. Position it anywhere and hit ENTER.