Hey Jimmi I think there are elements tied into the registry. When I registered ,the passcode thingy(technical term) wrote to the operating system drive - not my poser drive. I think CL would look at upgrading to a new machine as a valid reason to re -registering. Look at the numerous threads on installing. It does seem that if you have a good stable OS fully patched up with a stable install of Poser 5 and upgrade to SR1 it works. It looks as though if the install is unstable or misbehaving the patch seems to make matters worse. PaulC