WFaS is a mod of Warband. Stop being srupids.
I think it's a kind of ntdll problem.
Wait... you're playing c-rpg with WFAS now?(click to show/hide)
I don't...
Are you...
What?
Go to C:\Users\<<UserName>>\AppData\Roaming\Mount&Blade Warband and delete the rgl_config.txt (or somewhat similar). The file is recreated and sometimes causes crashs on start.