Graphics rendering issue

Hi All, and sorry for bad english:+ I have this problem on FS2004. I see squares of different textures in all the world. Like a puzzle.An example: Innsbruck in summer:And the problem is more visible in winter:I've tried all quality levels, from very low to ultra high. Check and uncheck graphic options. With ground environment and without. With original mesh-es and addon ones.I've also tried a lot of drivers, the latest and older ones.And reinstall too.My computer is:motherboard: Asus P5Bprocessor: Intel Core 2 Duo 6300 1.8GHzmemory: 2Gb DDR2 667Hz Kingstongr