Thanks Mac.
I've downloaded the driver. Not sure exactly what I should do next (I am not a computer techy!), daft as it sounds I don't even know if I've installed it! Does it happen automatically??
THere is now an icon on the tool bar at the bottom of the screen, and if I click on that it gives my sound card (?) in the WDM device list. If I go back to the MIDI / Audio settings window, ASIO4 is now the default so I guess I've done something right, but my keyboard still isn't working.
Do I need to do anything else?
Forgive my ignorance!