During the installation of Apache2 I got the following message into cmd window:
Installing the Apache2.2 service The Apache2.2 service is successful
Always double check httpd.conf to see if document root is correctly pointing to an existing folder
#if you have c:\your-main-folder\www\
DocumentRoot "c:/your-main-folder/www/"
#if you have c:\your-main-folder\www\sub-folder\
DocumentRoot "c:/your-main-folder/www/sub-folder/"
DocumentRoot points to a folder that must exist in your drive.