So it seems to be the 64 bits monitor drivers version
http://windows7news.com/forum/window...ncmaster-753s/. I was so happy with my new machine (quadcore Intel i7) and wanted to explore the 64 bit world, but it showed to be a little frustrating witg drivers and apps not working at all.
Anyway, thanks for the info

Many people is experiencing the same issue with samsung monitors and Windows Vista x64 too, just google "x64 samsung monitor driver". The only 64 bit drivers that seems to be working are for Windows XP...
We spent our money on those monitors and we want them with their maximum resolution and working on 64 bit OS, What we should do? Any info is appreciated
Greetings