I know the challenge has already started but....
My suggestion would be to reinstall some of the bits and bytes.

Use the Windows uninstaller to remove CCC. Then use Driver Sweeper to clean up after Windows. Reboot and install CCC 10.12 APP. Then reinstall BOINC and reboot again.
I did that last night and only 1 out of 3 systems will crunch. Even tried it twice on the other 2 in case I somehow did it wrong.