i have bought a car with the riocar in it, not sure if it's mark 1 or 2, but it seems to look like mark 1 but it does have a rotary knob. i have a problem with the clock and date function which keeps jumping to different times and dates. i also have a function that on start up tells me the day, time and date but these do not match my clock in the riocar and it als jumps around. i know nothing of these machines and almost nothing about computers so an easy solution would help. i don't mind if there is a simple way to format the whole machine. please help me.