Can you play medieval2 and kingdoms now? CA_LIBS error happens for a bad install most of the times and reinstalling the game should fix that;
I found 3 solution for the cases that reinstall doesn't fix the problem:
1. Change your language to en (if it is not)
2. Manual uninstall and then reinstalling (dont forget to backup your registry) : "http://shoguntotalwar.yuku.com/topic/24456"
3.launch errors fix: "http://forums.steampowered.com/forum...d.php?t=784119"