On the download page for Moodle, version 2.4.x requires: PHP 5.3.2
Your version PHP: 5.3.18
http://php.net/releases/index.php
Couldn't find 'several' instances of Moodle but did see a mahara and quite a few Joomlas. The one Moodle found does report an error ... 'could not find top-level course'. Even if one fixed that, there will be other errors that follow. The installation did indeed fail ... at least the creation of all the tables that are require creation before Moodle can populate them ... such as the mdl_config table.
Advise you don't have what is required for 2.4 nor a 2.3. Those other Moodles must be on another shared host/domain (different IP) which could also mean that shared host has the required PHP as well as other requirements to install 2.4.
Hint: highly recommend placing a 'blank' index.html page at the document root.
If you are still hosted the same site for which you provided this info in a previous posting/issue:
CentOS release 5.8 (Final)
2.6.18-194.3.1.el5 #1 SMP Thu May 13 13:09:10 EDT 2010 i686 i686 i386 GNU/Linux
Might also suggest shopping for another package from host or another provider. CentOS is 5.9 now and Moodle would run best on x86_64 bit machines - especially 2.x as it is resource and memory hungry.
'spirit of sharing', Ken