Installationproblem

I've been trying to install php on a server, but I can't get to work properly. The phpinfo() does show, and also a simple "Hello World"-script. But I'm trying to install a software (Kayako eSupport) and for that to work I also needed to install Zend Optimizer. Which also seems to work, since phpinfo() shows that information. But when I try to access the eSupport setup-page it's blank. PHP-version: 5.0.4 Server: Windows 2003 (IIS 6.0) I want to use Isapi, not CGI The thing is (I don't know if this is the problem) that the server root-catalog C:\Inetpub isn't in use. Instead every account has it's own root-catalog. I therefor add the path to this instead, both in php.ini and for Zend. Or maybe I've just configured the php.ini-file wrong. Any idea somebody? -Jessica