My 2004 flight simulator game isn't working! can you help?

when i click on the desktop icon,it keeps saying i need to put in disk 4,and i am putting in disk 4!

PLEASE HELP SOMEONE!My 2004 flight simulator game isn't working! can you help?
maybe u should just reinstall it...It always helps :)|My 2004 flight simulator game isn't working! can you help?
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