HELP MY SIMS 3 GAME CANT STOP CRASHING 10 POINTS!!!!!!!!!!!!?

I HAD RECENTLY BOUGHT THE SIMS 3 FROM EBGAMES.... I COULDNT BE BOTHERED BUYING THESE GAMES SO I DOWNLOADED THEM AS TORRENTS.... (THE EXPANSION PACKS) AND NOW I AM LIKE LITERALLY CRASHING AND STUFF LIKE THAT... I HAVE THE HP PAVILION G6 2150TX.... (LAPTOP) I DONT KNOW WHATS WRONG WITH IT? I ONLY HAVE GOT THE SEASONS DISK AND THE NORMAL DISK... I DONT HAVE THE RECEIPT SO YEAH I CANT RETURN IT... OR CAN I??? MY FRIEND GAVE ME IT :p I BOUGHT IT OFF HIM!! IS UNINSTALLING IT THEN REINSTALLING IT GUNNU HELP?? :P I LOVE THE SIMS AND DONT WANNA GIVE IT UP!!!!!!!!!!!!!!! IM SO ANGRY NOW :P IM ALWAYS CRASHING AND NOT RESPONDING... SHOULD I UNINSTALL THE GAME AND STUFF THE TORRENTS AND JUST INSTALL SEASONS OR WHAT??? I DONT THINK I CAN RETURN A PC GAME???? OR CAN I... I LOST THE RECEIPT AND AM SO ANGRY... HELP~!!!