Dave,
People will need more info to give suggestions. I.E Win XP or Win7, RAM, Video Card etc.
The registration code is usually found on the back of the manual, found in the box. It is a 6 block of 4 alpha/numerical groups.
Not sure what you mean by tried all the scenarios, as they are part ofthe program.
When installing, always turn off any anti-virus, and un-needed programs which might be running in the background. Also, run the setup with administrator rights.
Bob (CRO)