5
I actually solved this problem by rebuilding my web server. I used a program called XAMPP which is a software package that includes Apache Server, PHP 4 and 5, MySQL, PHPMyAdmin, and a few other useful items all bundled together with an installer program. When I used the installer that came with this free software, it automatically created all of my INI file settings. When I ran XOOPS after that, everything worked perfectly. I'm very certain that the problem was with the INI settings for PHP 5, but I have no idea which setting it was.