Just incase anyone else is having the same issues...
I just installed a new copy of both Firefox and AVG. AVG apparently partnered w/Yahoo! so now there's a Yahoo! search box that gets built into your browser. I don't like this. I tried to remove it by disabling the addon but it didn't work. I also tried to delete the addon in the addons folder of Program Files\Mozilla\Firefox but it wasn't there. So, after looking in different files for awhile, I realized that by opening up extensions.ini, which resides in your \Documents and Settings\Administrator\Application Data\Mozilla\Firefox\Profiles\profilename.default folder, you can edit out the AVG part. Just highlight and delete the line that references to AVG's folder, save the file, and poof the bar disappears.
I just installed a new copy of both Firefox and AVG. AVG apparently partnered w/Yahoo! so now there's a Yahoo! search box that gets built into your browser. I don't like this. I tried to remove it by disabling the addon but it didn't work. I also tried to delete the addon in the addons folder of Program Files\Mozilla\Firefox but it wasn't there. So, after looking in different files for awhile, I realized that by opening up extensions.ini, which resides in your \Documents and Settings\Administrator\Application Data\Mozilla\Firefox\Profiles\profilename.default folder, you can edit out the AVG part. Just highlight and delete the line that references to AVG's folder, save the file, and poof the bar disappears.