I've never had a problem with windows updates. I just had 193 of them install in one batch and no effect on any program including Trainz, Railworks3 and FlightSim X.
You are more likely to have problems if you stop the updates. Many of them are critical to the running and security of your computer.
If you still want to turn them off, right click on the white pennant, (i.e. flag), on the right hand side of the taskbar. Select open Action Centre, then select Security.
You can disable from here. Personally, I wouldn't.
Bob (CRO)