After I installed nvidia drivers and made them functioning with Xorg I have this problem : http://img34.imageshack.us/i/screenshort.png/
As you can see fonts went huge... I didn't change anything on themes and before I enable nvidia drivers everything was normal. Thanks in advance.
Finally I found the solution. Looks like I had a dpi problem or something like that. I added these lines into the "monitor" section on xorg.conf and fonts are normal again! These are the lines I added:
Option "UseEdidDpi" "false"
Option "DPI" "96 x 96"