I hav a serious problem wit my pc my graphics card suks.because of tat i cant play any 3d games.i need sugests

i need suggestions to for wat to do wit my graphics card because it suks.i really need help.i need suggestions also.i was plannin to buy a new pc but i started wonderin if i could tackle the problem witout buyin a new pc.i reallly need help.tell me some good prices of some graphics cards if i cant find any other way to increase my graphics card.thnx