Quote Originally Posted by Cambyses II
Remember that installing a modification permanently overwrites your game files and renders old save game incompatible. The only way to return to "vanilla" game is to uninstall and reinstall.
Or use a mod-switcher (e.g. this one), by far the more convenient solution. install a patched, but un-modded MTW:VI on your computer, make a file snapshot with the mod-switcher and then install mods at ease in a special subdirectory. each time you want to enable/disable a mod, run the mod-swithcer, then make your choices and wait a couple of minutes. eeeaasy!