I am trying to do the "3D Visualization Techniques" Virtual Campus course in ArcScene 10.0, but none of the TINs will load. If I try to repair or [re]add them, I get "Could not add the specified data object to the scene. Try using a smaller subset. Can't open the specified TIN." I'm using 64 bit Windows 7 Home Premium on a Lenovo G570 laptop with a 2.2 Ghz Pentium 4 and 4 GB of memory.