And you have the strings, tableau_materials, tag_uses, triggers, troops, variable_uses, and variables text files in the mod folder right?
to make sure you have all the necessary text files
Else what kind of computer do you have, Windows 7?
Or even maybe try removing the GLShaders folder (to the recycle bin) if you do not have Viking Conquest DLC.
Lastly I can suggest try re-verify integrity of game cache on Warband under the Library Steam tab and right click on Warband to select the game's Properties at the bottom. (If you have any mini-mods for NW or Native be sure to back those up before doing this, note for some people who never ever backup mini-mods downloaded. Main full mods should be fine.)
Windows 7, tried removing the GLShaders folder however it still didn't launch.
I verified the game cache and it said there was one file missing which would be re-validated, it's taking a long time but hopefully this will fix it.
Edit: Verifying the cache didn't fix it but I deleted a few modules I don't use anymore and suddenly it works now. I can't pinpoint what the exact module was as I deleted quite a few. Something to note though I suppose. Thanks for all the help, and the quick replies. I'll start playing it now lol