@ Daniel
Quote: "yea this is great and everything but i followed all your instructions and it takes like 45 min to build the leval then it stops at like 85 percent and just hangs there. My pc specks are 6 gbs of ram with a 9800 gt nvida card."
Try changing your Lighting Shadows to "Best for Permformance" in your Preferences. Because you change it to "Best for Quality", the software has to re-calculate the lighting. On our system, it also hangs towards the end. Once I changed it back, it worked and was fine. Some video cards also are the issue, whether the drivers are legacy, or other issues.
Cheers
Mike