Thanks for replying Stew451.  I did purchase the plants when I bought Infinite but I didn't realise there was a box for Vue 5 Infinite that needed ticking at checkout. That explains why the installer wanted to install into Vue 5 Esprit when I ran the installer and had to direct it to Infinite's folder instead, and why it asked for my Vue 5 Esprit serial when I tried to load it in the first time on my old Hard drive lol. 

Can I assume it's the copy right protection thats kicking in when I'm trying to load the plants as it's the second time they have been installed? 

@ Wade, yes I did register infinite, I've edited this post as I hadn't seen your reply.  Thanks for letting me know about editing the purchases at Cornucopia, I will do that now.

Thanks for the help.