Firstly this should be really be posted to the user forum:
Below is the best description of how to set up IIS & Tomcat. It is based on IIS 6 and Window 2003, but you should be able to adapt it. I used it as a guide for settings up a customer's production system. You should skip the section regarding the tomcat installation and set the serverRoot registry entry to the location of the jbossweb-tomcat50.sar/ directory in your jboss deploy directory.
Also it looks like you are using isapi_redirect version 1. You should use the newer isapi_redirector2. The best tool to trouble shoot the problems with the plugin is the NT Event manager. Any problems in the plugin will be reported there.