Trying to install on win2003 using IIS.and ms sql . When I attempt to run the install script (localhost/limesurvey/admin/install) I receive the error "SERVICE UNAVAILABLE)" Same error when I try to run any php script. Any ideas? Below are the steps I have taken.

Installed php 5.3.6
installed fastcgi
edited config.php (limesurvey)
dropped limesurvey in \inetpub\wwwroot\limesurvey
Changed permissions on limesurvey folder in iis manager
default web site properties -> home directory -> configuration - > .php = system32\inetsrv\fcgiext.dll (get,head,post)

(not sure about isapi filter - I could never find phpisapi.dll)

Ran script from browser localhost\limesurvey\admin\install ; returns "SERVICE UNAVAILABLE"

Thanks.