Problem with Railroad Tycoon 3 wrong disc inserted

i have this problem with railroad tycoon 3 saying that wrong disc inserted.
when i finish installing the game it say to insert disc2
when i inserted disc 2 it say wrong disc inserted
can some one give me a solution for this problem???

thankzzz
 
What operating system are you using? Is it XP as in your other post?
 
Try installing the game patch. Version 1.05 seems to be the latest.
 
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