This instruction fixxed my issue wiht Pillars, i could not go to Gilded Vale because the game crashed to desktop!
But with this you will fool your computer that you are running a 64bit system (or just unlock more RAM)
Well anyways, it worked for med and i really hope it will work for you guys/gals!
Best of luck!
http://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-enable-a-3GB-switch-on-Windows-Vista-Windows-7-or-Windows-XP-s.html