If you are in windows as I guess you are
Open Control Panel -> system -> Advanced tab -> Enviroment Variables Choose path from down area Click edit Change the path for php from C:\wamp\bin\php\php5.3.13 to C:\wamp\bin\php\php5.4.0 or whatever php 5.4.x version that you have
Please note if you have wamp installed in some other directory rather than the default one please check folder in explorer before you edit it
and I think it should be fine with you now