Cortona3D Viewer uses computer memory to render 3D scenes from VRML.
Please close all running applications before launching large VRML files in one of the supported 32-bit internet browsers.
On a 32-bit Operating System only 2GB of random access memory is available for every application.
In order to use more than 2GB RAM, please install 64-bit version of Cortona3D Viewer (can be downloaded here). 64-bit Cortona3D Viewer can only run on a 64-bit Operating System (instructions to identify system type). If the user's Operating System is 64-bit, then large VRML files can be opened in the 64-bit version of Internet Explorer (Start > All Programs > Internet Explorer (64-bit)).