FPS problems in all games

What do you mean by saying "fps problem". Give more details.
Here you have few typical things you can do if you are affecting lower performance on your computer:
- reinstalling drivers
- cleaning it from not needed files/registry records/programs
- new windows installation
 
I mean like fps spikes/drop from 50fps to 160fps and it's awful to play with that fps.
I've tried reinstalling drivers and cleaning registry and programs. I guess i need to reinstall windows.
 
The lag spikes you are affecting might be also caused by the game itself. Bad optimization from the gamemakers is quite normal these times.
If you have Windows 10 you can try turning off "Full Screen Optimization" in game .exe properties. (It caused a lot of problems for players lately).
Keep in mind that there might be a lot of reasons why that happens. If you provide us with a full information of your setup and try to observe and describe the problem more, then the help we could give you would be more precise.
 

When i trun off Full screen optimizations from a game the game starts flickering green.