PC Problems Help!

[kingproof101]

So I built my own computer nearly a year ago and this past 6-7 months it started lagging in two of my favorite Garry's mod and league of legends I was able to play both of them with high fps in Garry's mod I got around 250-300 now I get around 140 and it drops and lags down to 45 fps sometimes 4 and jumps back up to 100, in league when I place a ward it freeze and I get lag in team fights, I use to get 250-299 now it sticks around 120 and drops to anywhere from 45 fps to 34-32 so anyhelp would be nice. Build> http://pcpartpicker.com/list/y4DFrH

 

[schwatzz]

Do you use Wifi or ethernet? Try updating your network drivers and update router firmware. It could be your ISP. A recent Windows update could have altered a setting. A recently installed program could be interfering with the network. Try changing your DNS to Google's.

 

[kingproof101]

Do you use Wifi or ethernet? Try updating your network drivers and update router firmware. It could be your ISP. A recent Windows update could have altered a setting. A recently installed program could be interfering with the network. Try changing your DNS to Google's.

I use ethernet and how does one go by updating network drivers?