Forum Discussion
This is for the Garden Warfare PC game; I have no experience with any other PVZ game.
All caps is hard to read, against the rules, and impolite. It is the electronic version of yelling onscreen instead of talking.
If you have the disk-based version of the game, it will try to create a conflict with the Origin Game System by attempting to re-register all over again, which Origin doesn't accept. There is supposed to be a way to use the "Pause" before entering the CD Key number again, and then after you "Continue". the ESC key (I think maybe that one) will then allow you to skip past the Serial Number requirement.
It is somewhat unreliable, however, and many people cannot get it to work as advertised, so you simply skip the disk itself, instead. In the Origin Client game library, in the PVZ: GW folders is a free digital download to obtain and then install that.
Your questions had their answer in the forum for your game. Have you followed the advice?