The problem is the $WAGLOBAL_Root_URL setting in the WA_Globals file.
most likely you have this set to the root of your site:
but the power store files in a subdirectory of your site such as:
the $WAGLOBAL_Root_URL setting must point to the root of your power store file:
$WAGLOBAL_Root_URL = "http://www.aquafusionfurniture.co.uk/powerstore/";