You said you didn't know how to start 'Remote Procedure Call', if it says 'running', then there is no need to start it, therefore the problem lies elsewhere. If it doesn't say Running, then move over to the left hand side of the 'Services' window (where
the descriptions are) and click 'Start', underlined in blue.
Now, since RCP is already running, it would seem that Windows 10 is the cause of the problem. As it's a fairly new OS, there will still be some bugs and errors occurring as constant improvements and updates are being made with it in order for the OS to run
with full compatibility. My advice would be for you to downgrade back to your favourable OS, IF you really don't need/want Windows 10; and if you can still downgrade (There was a time limit).
You also said that you have multiple drives, and that you keep getting an error message saying 'this device is currently in use' or ('another similar device still seems to be running'), which usually occurs with software, as supposed to the hardware error
message. I have had the same problem too, but with my memory stick. What I usually do is when the error message occurs and it doesn't let me eject it, I just click 'Continue' (not cancel or Try Again). The reason I personally get this error messages is because I
always seem to try and safely eject the memory stick just as the memory stick has finished receiving (or transferring) all the data requested. Now with hard drives, I cannot say anything about that as I haven't experienced the exact problem, hence why I've
shared a similar problem with USB sticks and personal solutions.
I'm not very technical (with the exception of music production software XD) so if you do find any of this useful, then that's great.