Only variables should ...after hikashshop install

Hi there,
I install joomla 2.5.4, in my local pc, and after installing the latest hikashop business edition , it says installation successful, but I got the following bug in the front end ,and the back end.
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Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\LOCALTEST\plugins\system\hikashopuser\hikashopuser.php on line 16

Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\LOCALTEST\plugins\system\hikashopaffiliate\hikashopaffiliate.php on line 23

Strict Standards: Declaration of hikashopClass::get() should be compatible with that of JObject::get() in C:\xampp\htdocs\LOCALTEST\administrator\components\com_hikashop\helpers\helper.php on line 1155

Strict Standards: Declaration of hikashopController::display() should be compatible with that of JController::display() in C:\xampp\htdocs\LOCALTEST\administrator\components\com_hikashop\helpers\helper.php on line 809

Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\LOCALTEST\administrator\components\com_hikashop\helpers\helper.php on line 1169

Strict Standards: Declaration of hikashopConfigClass::set() should be compatible with that of JObject::set() in C:\xampp\htdocs\LOCALTEST\administrator\components\com_hikashop\classes\config.php on line 98

Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\LOCALTEST\administrator\components\com_hikashop\helpers\helper.php on line 1040

Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\LOCALTEST\administrator\components\com_hikashop\helpers\helper.php on line 1171

Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\LOCALTEST\administrator\components\com_hikashop\helpers\helper.php on line 1197

Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\LOCALTEST\plugins\system\hikashopgeolocation\hikashopgeolocation.php on line 40

Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\LOCALTEST\plugins\system\hikashopuser\hikashopuser.php on line 68
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and this is related to joomla and I fixed it by doing the following :
changing the line in php.ini :
error_reporting = E_ALL | E_STRICT

With this :
error_reporting = E_ALL

However , I'm afraid that I have done something wrong to hikashop component . and what those messages mean.

Thanks