artifacts on all my objects All my objects in all Layers have these kinds of artifacts, anyone know why that may be?, when i hit "P" to play blender game they dissapear, but its super enoying to work with when you are texturing and so on
Your End Clip value (in the middle right of your screenshot) is extremely high.

Computers have trouble calculating wide ranges of floating point (decimal) numbers with extreme precision and often end up with slightly inaccurate results. If you narrow down the range it has to calculate (by decreasing the End Clip), those artifacts will disappear.