Caba`drin said:
1. Go to \Documents\Mount&Blade Warband\ and find the file rgl_config.txt
2. Rename the file rgl_config_bad.txt
3. Try to start Warband...it should run.
4. If it does run, go to http://bugs.taleworlds.com/edit_bug.aspx?id=3720 and upload the file rgl_config_bad.txt so the devs can see what went wrong and hopefully fix it in the next patch.
Just tried it and it still doesnt run.
If it helps (I doubt it does) my mount and blade works, this is only happening with warband.
Edit: Just installed direct x as well. Works now, everyone should try this.