patching Xenogears

[spiderrr]

Hi, i´ve downloaded the image file of xenogears from www.sharereactor.com and copied to a CD. When i play the game on the PC using an emulator, the game goes well, but when a ply at my psX, the game stops at the second screen, sometimes it stops at the first screen... =/ why is this happening?! Please, somebody can help me!? do i have to use a patch?!