Toy story 3 PC game....extreme low quality?!?

okay so I'm a picky gamer when it comes to the quality/realism of a game...i bought toy story 3 for PC for me and my son to play after I've seen the movie...i get home installed it and played it...now the only reason i got this was because on gamespot.com, i looked at the game screen shots, and the detail of the character models were amazing! looked almost as good as the movie!...i start to play it, and everything is extremely low polygon, and extremely low quality...what happened??? even the levels i play match the screens on gamespot...but's the level of detail and quality looks like a PlayStation 1 game...i can't find any kind of settings...the game is very basic when it comes to customization...now i noticed in the actual game files, there are folders for each individual model...so i go into the buzz lightyear folder...there are model files that say "buzz lightyear" that are 500KB, and there's one that says "buzz lightyear high" and it's 3 megs! that's a good size for a game model...so it's like the files are there but not being used...any suggestions??? I'm stumped...i researched and for some reason no one else has this problem. and it's not my computer...my specs are windows xp service pack 3...4 gigs of ram...intel dual core 2.0GHZ, and an nvidia geforce 8800GTS, I can run just about anything on ultra quality without any lag...so...HELP!!!