L4D2 Authoring tools crash

Whenever i try to open Hammer from l4d2 authoring tools opens for a few seconds with the “Hammer” logo and then comes up “Hammer.exe has stopped working” the modelviewer and other things work fine and i have tried re-installing it… it was working a day ago… and i havent changed ANYTHING

L4D/L4D2 Hammer can take over 5 minutes to load, just wait.

Really?
This happens to me everytime. I’m impatient!

i’ve left it and it takes 3 minutes to load up (average)
thanks :smiley: