Graphics Problem in Gmod

in gmod i have always experienced antializing and anisotropic filtering problems and these white lines in dark places and sometimes even black blotches on the ground when im high up… i dont know how to fix it i have the graphics all the way up and even forced it through nvidia control panel but nothing changes…my specs are …Windows 7 x64, 4gb corsair dominator pc8500, 2.8ghz core2 quad, Nvidia 520gt 1.5gb

see on the mointains and in the back

see on the fence

Mountains: It could be the map
Fence: That is normal, not a huge deal.

Pretty much this. not much you can do about screen resolution, that’s the problem.