Need to clear PowerDVD4.0 Parental Lock

[A48SteveEllard]

Hi
This is my first post to a forum.

I have PowerDVD v4.0
It plays excellent however,
when I had PowerDVD v2.55 I set the parental lock and now I can't remember the password. It is set to only play G rated movies.
I un-installed v2.55 before installing v4.0 but it kept the parental lock.
How can I clear this?
Do I need a password crack?
What extra files do I need to delete after un-installing again ?

Please can anybody help.