I believe it is to remove the section from Poser UI prefs_1024x768.xml  or whichever screen size you use from C:Documents and SettingsOwnerApplication DataPoser 7

This bit.

    <WidgetPrefs widget="contentRoomTab"  left="300"  top="10"  bottom="24"  right="385"  collapsed="2"  rect.left="812"  rect.top="10"  rect.right="897"  rect.bottom="24" />

 

I would make a copy of the file before you try the deletion so you can restore it if something bad happens.