I fixed it myself.
https://forums.garmin.com/showthread.php?315197-Windows-10-and-express-not-working&p=698219

I ended up manually assigning a drive letter to my 510 and everything now works as...

Hi,
I upgraded to Windows 10 yesterday and everything works fine apart from this.
I have Garmin edge 510 and 200 cycle computers, when plugged into the computer they are seen by windows and show up...