that looks as it should. I am sorry I am out of ideas on this one
I will never recommend to anyone a complete reformat just because of the work that includes. But here is a complete uninstall/reinstall routine for all three games (if you decide to follow that just ignore the Warlords part) - of course if you do format the drive that is mute...
Uninstall and Reinstall Civ4 Warlords BtS :
Try to follow this order when doing stuff:
Use Control panel to uninstall Beyond the Sword, then Warlords, then Vanilla
Delete "...\documents and settings\<username>\my documents\my games\sid meier's civilization 4" manually
Delete "...\documents and settings\<username>\my documents\my games\warlords" manually
Delete "...\documents and settings\<username>\my documents\my games\beyond the sword" manually
Delete "...\documents and settings\<username>\application data\my games\sid meier's civilization 4" manually
Delete "...\documents and settings\<username>\application data\my games\warlords" manually
Delete "...\documents and settings\<username>\application data\my games\beyond the sword" manually
(note: application data is a hidden directory so you need to configure windows explorer to show hidden files, also these directories in application data are sometimes removed by the uninstall routine)
Delete "...\Program Files\InstallShield Installation Information\{CFBCE791-2D53-4FCE-B3FB-D6E01F4112E8}" (Civ4)
Delete "...\Program Files\InstallShield Installation Information\{3E4B349F-10B5-4586-9D99-489A90A8B228}" (Warlords)
Delete "...\Program Files\InstallShield Installation Information\{32E4F0D2-C135-475E-A841-1D59A0D22989}" (BtS) (note: InstallShield Installation Information is a hidden directory so you need to configure windows explorer to show hidden files).
Install Vanilla, immediately patch it to 1.61 (download it fresh from
here)
Install Warlords, immediately patch it to 2.08 (download it fresh from
here)
Install Beyond the Sword, immediately patch to 3.13 (download it fresh from
here).