hhhmmm well i know that since playstation discs are in fact dvds i reckon that maybe you downloaded Nba Street 2 in pal format( UK format)? Cause like i know that NTSC is the format for US/Canada. Okay i don't have a ps2 so i don't know whats wrong, but thats the only thing that comes to mind( same thing would occur for movies if you view a PAL format movie on your tv the picture/resolution would be screwed up a little), example:
DVD NTSC (MPEG-2 720x480 29.97fps CQ 65, Layer-2 48000Hz 384kbps)
DVD PAL (MPEG-2 720x576 25fps CQ 65, Layer-2 48000Hz 384kbps)
Check this out as an example my friend:
http://www.nforce.nl/index.php?do=nfo&id=30522
http://www.nforce.nl/index.php?do=nfo&id=29448