do the following to completely remove Civ4 aka Vanilla manually:
try the uninstall routine using control panel (that is what failed for people in this thread - but just in case someone else reads this
)
start the registry editor (regedit) and delete the following keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Uninstall\{CFBCE791-2D53-4FCE-B3FB-D6E01F4112E8}
then reinstall.
Do you want to remove the game completely? then you'll also need to delete all other Firaxis and Civilization and Civ keys in the registry - especially HKEY_LOCAL_MACHINE\SOFTWARE\Firaxis Games - (or reinstall and run the uninstaller which is safer) AND
delete all of the following directories that the uninstaller does not remove itself:
"...\documents and settings\<username>\my documents\my games\sid meier's civilization 4"
"...\documents and settings\<username>\application data\my games\sid meier's civilization 4"
"...\documents and settings\<username>\local settings\application data\my games\sid meier's civilization 4"
"...\Program Files\InstallShield Installation Information\{CFBCE791-2D53-4FCE-B3FB-D6E01F4112E8}"
"...\Program Files\Firaxis Games\"
Note: most of those are hidden directories so you need to configure windows explorer to show hidden files.
Hope this helps and Welcome to CFC