Did you uninstall the demo before installing the CD? I would uninstall both.
In fact I would uninstall the CD, do a System Restore to a date prior to the install, uninstall the demo if it is on there and then reinstall from the CD.
If you continue to get an error on the install, you might have a bad CD.
In fact I would uninstall the CD, do a System Restore to a date prior to the install, uninstall the demo if it is on there and then reinstall from the CD.
If you continue to get an error on the install, you might have a bad CD.