CDROM Drive Crashing My Computer?

Its been happening for maybe a month now, whenever i put a game CD in the computer, sometimes it runs fine, and sometimes it dosen't, its like a 90/10 chance that it will screw up.Whenever i place a cd and it DOES screw up, here is what happens, first it will make the loading noises, fans get noisy, etc. as Usual, then suddenly, i hear a 'click' noise, a familier noise that i hear when i hit the 'Reset' button on the case.So when i hear the click when i loaded the game up, after a few seconds, the mouse stops moving, and then the sound goes off, and it sounds as if the harddrive is making the same sounds as it does when it restarts but the screen is frozen on what it was last viewing.So, basically, the computer makes restarting-like noises nearly everytime i put a cd in the cdrom drive and freezes, and i have to shut it down w/ the button on the case.