GroupOffice has been installed into:
%%WWWDIR%%
You will probably want to add an alias to your httpd.conf file,
somethinglike this:
Alias /groupoffice "%%WWWDIR%%"
And restart Apache.
open to install
http://<hostname>/groupoffice/install/install.php
or update
http://<hostname>/groupoffice/install/upgrade.php
in a web-browser and follow the configuration instructions.