i installed mapserver from osgeo and all went smooth
then, i wanted to install postgis, and the easiest way is with EnterpriseDB installation http://www.enterprisedb.com/products-services-training/pgdownload (as said in this forum in another thread)
but i get an error saying that i need to have EnterpriseDB's apache installation in order to install phppgadmin.
in the FAQ of osgeo they have a section about this situation (say i install EnterpriseDB apache first) https://trac.osgeo.org/osgeo4w/wiki/FAQ#WhatifyouwanttowebenableOSGeo4WbutApacheisalreadyinstalledie:notbyOSGeo4W
but it is missing the main explenation! :-\
can any one fill in the gap?