Same answer as always: Update your graphics driver, which may or may not be possible. Your mention of a core3i already kinda makes me think you simply have a built-in/ on-die graphics processor, which is less than ideal to begin with....
thank u for your responce
i have checked my graphic driver for update & i found out that it is up-to-date
it is ATI catalyst mobility radeon 5470 Version 03.00.0758
my labtop is dell inspiron N5010 core i3 ...so if u can recommend me a graphic driver that solve the 3d problem , i would be very grateful to u
again thank u in advance
Did you check the Dell web site, specifically?
If not, go there, enter your service tag number, and see what the latest display driver they offer for it is.