Hi Rick,
Please try adding the following information in web.config:-
<configuration>
<system.webServer>
<defaultDocument>
<files>
<add value="index.htm" />
</files>
</defaultDocument>
</system.webServer>
</configuration>
Alternatively, enter the following at the command prompt:
appcmd set config /section:defaultDocument /+files.[value='index.htm']
where index.htm is the default document to be added. You may try restarting IIS after the above steps.
Regards,
Anit Kumar