Hey Admiral, with Edugeek Joomla package, you have to use PHP 5.2.9
Option nr. 1:
Take it from here: PHP Windows : WampServer 2
Just execute the downloaded 5.2.9 setup over your previous Wamp installation, and when complete, change the PHP version from the try icon.
I suppose that you have now PHP 5.3.1 if you used the last version of Wamp.
Option nr. 2:
Another option is to upgrade Edugeek Joomla package from 1.5.10 to 1.5.18.
Use this how to: Upgrading 1.5 from an existing 1.5x version - Joomla! Documentation
This way, you can use latest PHP version without problems.
I've used both methods with success, but in real live environment you better use option nr.2, because hosting platforms will be upgraded to newer versions of PHP always.
Ask more if you need help.
Regards,
Costi B.