Call of duty 4

this game used to run great on my dell xps410 but I tried to run it last week and I get the message “insert correct cd”
also “cannot write a file hard disc full” whats up?

It sounds like you need to put the correct cd into your optical drive so that the copy protection put into the game can confirm you have a legal version. If you have the correct disk in now, you might want to check the operation of your drive. The game might have gotten corrupted in some way also.

[I]Hard disc full[/I] is equally self evident, unless of course you have plenty of room and the game is simply fubared to the point it cannot access the hard drive properly.