Game crashes when turning on post Processing

Hi, so Ive been playing with post processing turned on and all graphics settings at max with no probs ever since I got my new pc. Runs fine, never any problems. tried streaming to record a vid today, game went to shit, turned down all graphics settings to make it work.

when I came to turning them all back on, they all went back to normal just fine appart from post processing. whenever I turn this on my entire game crashes out, tried rebooting pc, tried doing it in different zones etc, nothing seems to help.

This is the error I get



any ideas?

A bit late, but maybe someone else has the same problem and it can help him/her: do it on the login screen, it won't crash you (it works for me at least, while turning it on in-game crashes me).