Help on Vice City

[flipbata]

hi im kinda new and i got a question...

i have a ps2 not sure wat version its a scph 30001 R and i got it modified recently. im not sure wat type of mod but its a direct load without inserting a gameshark. i can ply dvd-r and cd-r games no problem but when i bought a copy of gta vc it always seem to freeze and says error after 5mins into the game. i cant even move to the first mission. im just wondering wat is the problem and if i buy the original would there still be any problem or would it be better?

thnx