You'd have to edit your template using the DAXEDIT utility. Here's what you must do:

1. Run Daxedit and open your template (CMI Style.dax)
2. Select the 'Start page' tab
3. Search for the following text and remove it

<tr>
<td vAlign=top align=left class=browsefld>
Browse by artist
</td>
</tr>
<tr>
<td align=left class=bodytext>
<UL><!--[Group(artistsort,overview)]-->
<!--[GroupPageLink]--><!--[GroupField]-->??<!--[/GroupField]--><!--[/GroupPageLink]-->&amp;nbsp;
<!--[/Group]--></UL>
</td>
</tr>

4. Save your template and try exporting again.

Note: You should probably make a copy of your template before you alter it.