You are running windows XP 32-bit, due to operating system addressing constraints a 32-bit operating system can not address more than 3.2GB ram, you need to get a 64-bit version of windows, windows 7 or windows 8 would be best...
As for a video card, what resolution is your monitor?? Do you play games? What games?
thanks a lot every one for helping me, i will upgrade to 64bit soon .
i dont play games but i watch movies/videos some times .
my monitor max resolution is 1920 by 1440 pix
and minimum is .. 800 by 600 pix