Alt tab/Alt enter crashes

[Slayer]

I get a similar problem on some occassions, only when I tab out/etc I have a non responding mount and blade and after that have to force end the process, and on the rarer occasion it plain off crashes. I have no idea why it occurs, so the only thing I can suggest is for you to minimize the time you spend tabbing out while playing to help avoid this from happening.

It is instant crash

Another note is that sometimes my computer locks up and I can't even end the process, which leads me to force restart by holding the on button. :/