laws215,
We've never heard of this issue, and we have lots of installs every day. I'm not sure what happened during the install process, and we can definitely try to unravel it. However, hopefully you have a backup of the site before the installation. If so, I'd honestly recommend rolling back to that as it's difficult to know what has happened to your database, files, and other parts of the site from the description you gave.
If you need to cleanup what is there, can you let me know a few things:
1) What is your PHP version?
2) What is your MySQL version?
3) What type of host are you on, Linux or Windows?
4) Was this site every Joomla 1.7 or earlier.. did you migrate to Joomla 2.5, or was it 'fresh' install of 2.5?
5) If you go to Extension Manager -> Database, do you get a message like "Database table structure is up to date."? If not, what do you see?
From here, can you uninstall all of the plugins, components, and SCLogin module? I know you have duplicates, but I'd recommend using Joomla to do the uninstallation, if it will allow you to. If you can't uninstall, please let us know what error you get when you do.
Thanks,
Alex