I'm not sure if thats the problem.. you didn't give us a very detailed description...if you still have problems I'd take it up with Atari..if somone can provide a link to their forums...?
http://www.ataricommunity.com/forums/forumdisplay.php?forumid=315
Here's one to the help/tech support forum:
http://www.ataricommunity.com/forums/forumdisplay.php?s=&forumid=344
http://www.atari.com/us/support/newfaq/rollercoastertycoon3.php?browser=1&pageDisplay=MAIN
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