Help uninstalling Civ IV ?

ok after upgrading to version 1.74 i've noticed some problems with civ... It wouldn't recognize "Disc 1" as the correct disc, even though I know that it is. So i decided to uninstall civ and later reinstall it. But the problem is for some reason I'm not able to uninstall civ. So I decided to search my entire computer for anything labeled "Civilization IV", "Civ 4", and all other possible variants. Now when I insert Disc 1 a menu pops up with the options of Install, Readme, and Exit (they used to be the same, except instead of "Install" it was "Play")... but when I click Install an error window pops up saying that version 1.74 is already installed. What can I do?!?!?!?!? Civ 4 still shows up in the uninstall programs list... but it still displays an error when I try to uninstall it... I'm sure I've gotten rid of ALL files related to Sid Meier, Civilization 4, and Firaxis Games but it still won't work!!! WHAT SHOULD I DO???