Jobberbase 1.9.1 Installation woes in Godaddy Windows Shared hosting Account

Recently I tried to install Jobberbase1.9.1 in my Godaddy's Shared hosting Account. I followed all the instructions carefully written in the wiki for IIS7.
But soon I hit the roadblock. I started getting 500 server error. I got frustrated. I tried again after replacing web.config file with .htaccess files in root as well as admin directories. I was able to access the website but not the admin link or any other link for that matter.
I posted the problem in the godaddy forum and got the reply from Christopher G about activating error description in web.config files. So, I added following lines

        <httpErrors errorMode="Detailed" />
        <asp scriptErrorSentToBrowser="true"/>

    <system.web>
        <customErrors mode="Off"/>
        <compilation debug="true"/>
    </system.web>

based on

<configuration>
    <system.webServer>
        <httpErrors errorMode="Detailed" />
        <asp scriptErrorSentToBrowser="true"/>
    </system.webServer>
    <system.web>
        <customErrors mode="Off"/>
        <compilation debug="true"/>
    </system.web>
</configuration>
to enable error description. And soon I got 500.19 - Configuration data is invalid Error. And default document tag(index.php) in the config file was giving the error.

<defaultDocument>
            <files>
                <add value="index.php" />
            </files>
</defaultDocument>

I deduced that must be godaddy's iis7 configuration has already index.php as its default document. So, I removed the following entry, and voila, no problem anymore.
I removed the following entry from the web.config and web-admin.config files to fix the error.
<defaultDocument>
            <files>
                <add value="index.php" />
            </files>
</defaultDocument>

I am writing this so that it may help you if you face similar problem. And I guess, it must be the same with .htaccess files.