Sony walkman nwz-b105f won't read

Windows Vista home premium

sony walkman nwz-b105f

Worked fine for 6-7 months then started to disappear from the drives list. It charges but if I press the power buton it turns on and then off, if hold is on then it turns on then says 'HOLD' and then 'POWER OFF.'I upgraded the firmware when i started having the on/off problem and it worked, but after a day it got worse. Now I can't even see the walkman in windows though windows does 'see' that there is something there but it gives a fault 'This device cannot start. (Code 10)'

Any help would be appreciated.