Lightsmith

Hi. Just downloaded V18(64) and entered the activation code. That part went well, except there's an "ERROR:" message in the modeling window. Project Workspace looks correct. Tried to open other V17 projects, other tabs, and start new ones, but nothing shows other than the error. Was using V17 with no issue. Have an HP Windows 7 machine with an i3, 4G RAM. Any help would be appreciated. Thanks, CS