4
Could be the php and MySQL versions - at 5...the recomended requirements are:
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To install XOOPS for the first time you’ll need to have the minimum following server software pre-installed on your host webserver:
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HTTP Server (Apache or IIS) “Note, XOOPS only officially supports Apache”
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PHP 4.1.0 and higher (4.1.x recommended) Note: PHP 5 may cause a problem until the next release. If you have PHP5 please check the Troubleshooting note.
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MySQL Database 3.23.XX or 4.xx (XOOPS will have compatability with MySQL 5 in the next release.)
Before starting the install, be sure to have on your host webserver:
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Setup the HTTP, PHP and database server properly.
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The capacity to create a database for your XOOPS installation
(If you are a new user to XOOPS and creating websites, check your hosting company has or can create one if you can’t. If you are not sure ask them questions you have and they should assist you. The install script does provide this capability with the proper privileges).
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A user account with the proper database permissions.
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The ability to set the following directories and files world writeable: uploads/, cache/ and templates_c/ and the file mainfile.php
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Turn cookie and JavaScript support in your browser on.
From
here at xoopsdocsSince you are a newbie go to xoopsdocs and grab the released manuals too