hey dude d,not worrie about that.
first intel hd graphic 4000 it no't a graphic card. it a GPU //////the intel use your memory ram to build graphic when u saw the system only use 64mb that mean the system like window 7 need 64mb to run very well. those 64 mb are your memory ram and when u play a video game it actually use more ram to buld graphic. when u playing open you (INTEL GRAPHIC MEDIA CONTROL PANEL) and u going to look that u system it use more ram sometimes like 512mb or more. depend how HD graphic use the game. sow d,not worrie about that every thing with u intel HD graphic 4000 it fine....