Just in-case anyone is still having Win10 issues, its very simple. Download Open Hardware Monitor from openhardwaremonitor.org. Once you open OHM, proceed to installing the skin and open Rainmonitor. Select edit skin, and just change the Name of your GPU to be exactly the same as OHM... IE for me NVIDIA GeForce GTX 770. Do this for both Clock\Temp, and usage and it work.
I think the OHM in this skin is outdated, thus it doesn't work.
Hope this helps.