PC performance bad after reformatting

Hi.
I turn to you since other computer expert has not been able to find a solution to my problem.

Efter reformatting Windovs on my computer I havent been able to get it to perform as good as before the reformatting. The game which I was able to play on high graphic settings before, can't be played without the graphic lagging even when the settings is in medium og even low.

How can this be?

What I have done so far:
- All drivers are updated manually and via Slimdrivers
- Power-settings is set to high performance
- Settings in BIOS has been set to high performance(At least thats what i think. Pictures of the settings is attached beneath)

- https://www.dropbox.com/s/sktrzln3sd...2015.56.55.jpg

- https://www.dropbox.com/s/f70lf5n9zn...2015.58.01.jpg

- https://www.dropbox.com/s/x09qlvhvey...2015.58.30.jpg

- https://www.dropbox.com/s/lorrg2hod9...2016.00.34.jpg

- https://www.dropbox.com/s/g4g17o08ym...2016.02.31.jpg

- https://www.dropbox.com/s/k6fvq7h25u...2016.02.52.jpg

Info on my computer system:
Windows 7 OEM Home Premium 64-bit
2x Kingston DDR3-1333 4 GB (1x4GB) SINGLE MODUL
Intel Core i5-2500 4x3.30GHz (Socket LGA1155)
Gigabyte GA-PH67A-UD3 Socket 1155 USB3 og S-ATA3
ZOTAC GeForce GTX 460 1GB AMP!
Corsair Enthusiast Series TX650 V2 - 650W
Seagate Barracuda Green ST2000DL003 - 2TB