mio didgi walker c510?

I downloaded the latest version of mio transfer (mp3) and the touch screen was malfunctioning (pressed one button on the screen and another funtion happened)
I re loaded the origional version of mio tranfer from the disk and it is worse than ever and I can not get into mio map at all. tried the reset and the screen calibration but that was just going round and round.
any suggestions please