Your GTX 560Ti card is not capable of running Resolve 15.
It's not capable of running Resolve 14 either, although it may have sorta kinda worked in OpenCL mode.
Regarding your BSOD and restoring from a Win10 backup. None of the Resolve stuff came across properly.
So I would advise you to follow the process in my last post in this thread:
viewtopic.php?f=21&t=71142&hilit=+regeditAnd also rename the C:\ProgramData\Blackmagic Design\DaVinci Resolve folder to something else, like DaVinci Resolve.old
Then reinstall Resolve. If 15b3 really was working, it must have been in OpenCL mode, so maybe that will still work in b5, but your GPU is really not suitable to running Resolve 15.