help with rct3

i need help downloading parks onto my game everytime i try to go into any park it says that rct3 has encountered a problem and needs to close. plz help me!

I'm having my own problems with custom scenery myself right now.I made sure to put Shyguy's mainstreet scenery packs & expo3000 pack into the correct folder but when I go to play the game it crashes after about five minutes of play regardles of wether I actually place any of those items in the park or not.

Looks like I'll have to un-install the game & clear everything out then reinstall but from what I hear soaked presents somewhat of a problem...I've got RCT3 plus both expansions but havn't un-installed them yet,for the time being I'm stuck playing RCT2.