Problem with isapi_redirect.dll

[Hichem Sellami]

        I am installing Tomcat to work with IIS, but I am having a
problem getting the ISAPI filter to work properly.  
        I get the following message when I start the IIS service (in the
Event Viewer) 
        The HTTP Filter DLL C:\Program Files\Apache Group\Tomcat
4.1\bin\win32\i386\isapi_redirect.dll failed to load.  The data is the
error. 
        
        I already checked all the following:
        1. Registery entries.   
        2. worker properties files
        3. PWS virtual directory and filter definition.

        Anybody has any idea what's going on here.

        Thanks.