The clutch works, so I am pretty sure it is the throwout bearing. If you start it in neutral, everything is fine, but when you press in the clutch pedal and attempt to put it in gear, you can't. With the engine off, and when you press in the clutch pedal, the control rod on the transmission housing moves normally. However, when you have the transmission in gear, and the clutch pedal depressed, and then try to start the car, the car leaps forward because the clutch is still engaged, so I am fairly sure that the problem is with the throwout bearing.