Problem with top menu

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Sorry if this has already been mentioned,

Ive installed the edugeek package on my xampp system, when i load it up i see the following message in the top right of the screen

Warning: Parameter 1 to modMainMenuHelper::buildXML() expected to be a reference, value given in C:\xampp\htdocs\site\libraries\joomla\cache\handle r\callback.php on line 99

When i look in the menu properties in the administrator section i get this

Warning: Parameter 4 to JHTMLMenu::treerecurse() expected to be a reference, value given in C:\xampp\htdocs\site\libraries\joomla\html\html.ph p on line 87

Warning: array_slice() expects parameter 1 to be array, null given in C:\xampp\htdocs\site\administrator\components\com_ menus\models\list.php on line 143

Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\site\administrator\components\com_ menus\models\list.php on line 147


Any ideas what ive done wrong?
Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\site\administrator\components\com_ menus\views\list\view.php on line 65

[pagelad]

In fact looks like ive got errors all over the place

Warning: Parameter 1 to JHTMLGrid::access() expected to be a reference, value given in C:\xampp\htdocs\site\libraries\joomla\html\html.ph p on line 87

Warning: Parameter 1 to JHTMLGrid::checkedOut() expected to be a reference, value given in C:\xampp\htdocs\site\libraries\joomla\html\html.ph p on line 87

Warning: Parameter 1 to JHTMLGrid:ublished() expected to be a reference, value given in C:\xampp\htdocs\site\libraries\joomla\html\html.ph p on line 87

Warning: Parameter 1 to JHTMLGrid::access() expected to be a reference, value given in C:\xampp\htdocs\site\libraries\joomla\html\html.ph p on line 87