As the 810c is already available within the O/S since Vista, read ..
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01655752&cc=uk&dlc=en&lc=en&os=2093&product=58742&sw_lang=
Now saying that, it may be detected as a 812c and you may need to unplug from USB a couple of times for it to detected correctly.