Suddenly low framerate on good gaming computer (That had great framerate).

[MAttyg1]

My computer
Intel i5 4690k
gtx 970
8gb ram
550w
windows 10

has all of a sudden not been able to run the games that i used to be able to run at over 60fps at ultra settings.i now go from 291 frames on CS to 10 and it will keep repeating this, some games i cant even play anymore like H1z1 becasue i get 3 frames

is there anyway i can fix this?by the way all the drivers are up-to-date

 

[cats_Paw]

What power supply do you have? (brand and model).