Tammy,
Do you get an error message or anything else that may help us diagnose the issue? We use AdminTools on this site (as well as many of our users using it as well), so that shouldn't be an issue. If your anti-hacker software prevents other extensions, I can see it affecting JFBConnect, but if not, I doubt that's the cause. Again, if there's an error or other message, that would help. Until then, I'd check your /tmp folder to make sure it's writeable and that you're using the latest version of Joomla (v1.5.26).
Gail,
How are you trying to extract it? We'd recommend using the built-in unzipping software within Windows or Mac. If you're using a 3rd party utility (WinZip, WinRar, etc), we've heard of outdated versions of those software packages having problems unzipping our main package. However, the built-in OS software works for just about everyone and we have many users unzipping our files every day without issue.
Hope that helps get you started, but if either of you have questions, just let us know!
Alex