So you can launch warband, verify it's saying it's version 1.143, and go in game? In game enter a village or town or castle and see if the game bugs out.
I'm still betting you don't have the most updated version of WARBAND installed (or your version is corrupted). If you don't, then obviously crpg won't be able to install properly as it's only compatible with the latest version of warband.
That being said, it's also possible you're on the latest version, but your files have become corrupted. Maybe try reinstalling warband, and then update to the newest version of warband.