I tried the link but found nothing constructive enough to fix the problem...
I had another trawl through properties etc. and found this message on both drives...
"Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 19)"
It gave me a button to click for "Troubleshoot" but this just led me to a blank page with a "search" window...didn't know where to start with that.