About my laptop perfomance... PLEASE ANSWER ME FAST?

I play in a game called Lineage 2 I have 3 giga ram, but the game still doesnt work really good... can I change something in my notebook like upgrading graphic or video card with AGP ( cause I dont have and ot seems it is this the problem: it says that "the game may not be consistant because AGP is deactived. Please actie AGP for consistancy")... thanks guys