it installed fine, but when i want to load it up, it says "please eject and re-incert the cd-rom, press ok, then re-start the application". what do i do?

I am assuming that you are running a copy.. If you got the copy of someone then check and see if there is a crack on the CD.. If not download one.

no cause it installed fine in another computer, and both disk are perfect. but in the other one, the graphics for the game are all jittery and discolored, and everythings wrong

If a copy is made with a drive only capable of writting regular bit patterns almost correctly then the resulting copies will load up fine on some drives and not on others.

You never answered me though. Is it a copy?