scparker62,
That's a common error from my experiences at least. The following might help you debug it.
In your IIS Manager's top most level node (machine level), review your ISAPI & CGI Restrictions settings. I assume that those settings are available, if they are not, then you need to install that role service in your web servers roles in your Server Manager (this is straightforward enough). When you double click the restrictions settings do you see an entry such as:
jakarta Allowed <path_to_the_isapi_redirect.dll>
I'm guessing you are missing this piece as the old redirector doesn't add this configuration to IIS7 (as it wasn't part of IIS6 configuration and therefore doesn't get mapped accordingly) if I remember correctly. Also, jakarta is a default value set inside the install_isapi.vbs script, if you changed that value you will want to ensure jakarta is changed to match whatever you used.
If that setting is there check your website level tree node where you installed the jakarta application (either "Default Web site" or whatever you chose when running the script). Review the Isapi Filters and ensure you see an entry similar to:
jakarta <path_to_the_isapi_redirect.dll> Local (or Inherited, but preferrably local)
I'm going to assume this exists (install_isapi.vbs should add this) but thought I'd check.
Underneath your "Web Site" ensure that the "jakarta" (or whatever if you changed it) application exists. Review the Handler Mappings settings and look for a setting similar to the following:
ISAPI-dll *.dll Enabled File IsapiModule Local (or Inherited)
It is quite possible that this is disabled. The install_isapi.vbs script seems to disable this sometimes if run multiple times for whatever reason. If it is, enable it. You might also want to ensure that this setting has script and execute permissions.
Lastly, ensure that you did not make a typo to any path when running the install_isapi.vbs script (yes, it does happen). You can review the registry settings that the script writes to check this. Run your regedit, and go to HKEY_LOCAL_MACHINE -> Software -> Apache Software Foundation -> Jakarta Isapi Redirector -> 1.0. Ensure the paths to the worker_file and worker_mount_file is correct.
If you change anything given the above information, restart IIS/Tomcat and retest.
Dan Stusynski