Tony,
Hmmm.. that is a strange error that we haven't heard of before. Can you go to the JFBConnect Control Panel -> Updates icon and see what is shown as installed (or not installed) there? Basically, just about everything should be installed *except* for addons for extensions you don't have.. For example, if you don't have Kunena, the Social Profiles - Kunena plugin shouldn't be installed.
Let me know if anything seems out of the ordinary there as it will help narrow down what plugin/module didn't install and we can investigate further.
Also, can you let me know:
* Were you upgrading from a previous version of JFBConnect, or is this a first-time install?
* Have you tried configuring registration or other features, and if so, have you run into any issues?
Thanks,
Alex