External Hard Drive Not Showing In Windows Explorer

My external USB hard drives always used to show up in either My Computer, or Windows Explorer's double pane view in Windows XP.

Although they still show in My Computer, they do not show up in Windows Explorer anymore, unless I select them in My Computer First - and then choose the "Folders" selection.

PLEASE ... do Not give me the standard answers which are for External drives that don't show up Anywhere .. because the drives DO show up in Disk Management, and they DO show up in My Computer, and this is Not a new drive that needs to be formatted.

The problem is Limited to the double pane Windows Explorer view.

Does anyone know the solution to this specific problem ?

Thank you
danslink@hotmail.com