Error 5 is a permissions error stating you don’t have access.
You need to log on as a Windows administrator to install and register the Viewer software. A standard user account selecting ‘run as administrator’ will NOT work.
You must have write access to the following folder:
“C:\ProgramData\LockLizard\PDCViewer” (Windows Vista or above)
“C:\Documents and Settings\username\Application Data\LockLizard\PDCViewer” (Windows XP).