Getting Error message in IIS when trying to run a perl script

Hi,

I have set up a new IIS server which I can confirm that works because non perl pages are loading without any problems. However I need to install a perl application on the server. I have installed perl on the server, set up the correct handlers, made sure that perl is allowed in ISAPI and CGI Restrictions and given permission on the folder that Perl is installed. 

However I m still getting the error :

The error code is 0x800704ec

I have tried following the thread (http://forums.iis.net/t/1014986.aspx) which is mentioning that I should probably update some applicationhost.config file but I cannot find it...

Thanks in advance for your help

Gordon