Wonky FPS in Full Screen, Good FPS in Windowed

[Komitoza]

So, for some reason when I'm in full screen I barely get 60 very unstable FPS (lowest being 30 even though there are not that many people around) which makes aiming close to impossible because of the mouse lag.
I play on lowest settings and 1024x768 rez (I only have texture and effect details up high enough so that I don't have textureless ships or invisible gun projectiles).

The weird thing is that in windowed mode I can get up to 150FPS, but everyone knows how inconvenient it is to play in windowed. |8
Is there anything I can do to fix this or at least get a stable framerate out of the game? It could just be the bad hardware but it doesn't hurt to ask.

Don't faint when you see the CPU temp.
http://prntscr.com/g4qyox