I may surely be wrong but I am convinced that the problem is somehow software ...
graphic card works, cpu works
the scores may be low but it can easily be due to incorrect configuration of driver settings, mux bios, windows power profile, software conflicts etc etc ...
from my experience with...
leaving just my opinion here...
I see from this screenshot that your system is heavily bogged by a background process named "taskhostw.exe" which is using ALL your resources...
we are talking 98+% resources
I think you may have a severe SOFTWARE problem rather than hardware, maybe a wrong...