The only possible thing I could believe to be the cause is improper usage of the libraries accessed in TurboC7 that are related to movies movement, location acquisition, functions, mouse simulation, clicking, etc.
If you have that in your developed programs, then I recommend checking the code for possible errors.
I've installed TurboC 7 and launched a sample program and the mouse was working correctly. Try running the program in Window mode instead of Fullscreen. To do this, press ALT + Enter.