This might do the trick...
http://www.mydigitallife.info/2009/08/12/display-and-show-classic-navigation-tree-pane-in-windows-7-explorer-for-users-folder-control-panel-recycle-bin-and-cddvdbd-drives/

>Is there a way to have a classic view in Windows 7 when in Explorer? Before, I was able to drag a file from one drive to another but now they are being shown at one at a time.