Are you talking about Premiere Elements or the Organizer?
Premiere Elements should only load the media files you've actually loaded into your Premiere Elements project.
You do it in two separate places:
To disable photos in the Organizer start up PRE9 in Organize mode and then, under View> Media Types, deselect Photos (or use [Ctrl]+). Next time you start PRE in Organize mode it remembers that setting.
In PRE project mode click the 'Show Still Image' icon to deselect it. Again this setting is remembered.
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That worked perfectly.