Post the code that is causing problems. If we can look at it, we may be able to help. Also, tell us what it is supposed to do and what it seems to be doing instead.
Until then, here are my suggestions:

1. Make sure you have a robot.
2. Make sure the robot has motors.
3. Make sure the RC is attched to the motors.
4. Make sure the wheels on the robot touch the ground.
5. Make sure you know assembler; it's so much better than C. (Bah! High level language.

)