1) Did you uninstall Weapon before installing the one on the disc?
2) Have you, at any time since this problem started, done a complete uninstall which includes removing the registry entry as explained in KB #685?

Did you install it as an administrator. I ask this because sometimes when you put the disc in the drive, it will autorun and the application will want to be installed. If that happened, and you just allowed it to install, maybe that is causing the problem. On the other hand, it could be that the Activation didn't work properly (same problem on two different installers) and you need to do #2 above.

Mark