To clarify the fundamental question about AVG Free Edition registration:
AVG Free Edition does NOT require users to get registered. Registration is required ONLY if you want to post or comment on any thread within the AVG Forums.
AVG Forums is set for read-only access to anyone without the need of registration. However, if you want to post a comment or raise a question related to AVG products....
The registration process is quite simple. You cannot transfer your registration from the 'Old Forum' to the 'New Forum'. The New Forum has been built on highly secure platform which means that the transfer of registration from the Old Forum to the New Forum wasn't feasible. To use the 'New Forum' you will have to re-register & your email address will become your login. You should be able to use your present username as your "Nickname". Once you are participating on the forum if you ever cannot find a post you have made, use the Forum Search and search by your user nickname or check out 'View all Posts' in your 'Profile'.