got an Mobile Action ma-700 and windows native bluetooth driver did not recognise it. I read that others have the same problem,
so here is a Fix that I came up with.

uninstall all Bl-software,

find bth.inf in c:\windows\inf folder.
edit and write:

in [Manufacturer] section write:
Mobile Action=MobileAction, NT.5.1

and in section ---- Device section - Start ---- write:
[MobileAction.NT.5.1]
Mobile Action Bluetooth Adapter= BthUsb, USBVid_0DF7&Pid_0700

thats it,now it will find new hardware and install the windows bluetooth driver!!!

this must work with other brands too,just change name,PID and VID.
this can be found in device manager just when "new hardware is found"

I posted this in other forums also,hope I'll help somebody with this,searched a lot but found nothing.