If I play with default vehicles the problem is fixed but I wonder how my old computer 3GB of RAM Nvidia GT220 2.0 GHZ of Cpu dual core could handle that vehicles.
Also I lowered my settings nothing fixed.
My PC Specs:
Intel(R) Core (TM) i5-2400 CPU @ 3.10GHz 3.40GHz
RAM: 8 GB
GFX: Nvidia GT 440
OS: Windows 7 32 bit