Found the answer, courtesy of the pro-networks bulletin board:

" You are unable to browse a CD in My Computer or Explorer however the CD works perfectly when auto running and installing.

To resolve this issue do the following:

Click Start

Right click on My Computer and click on Manage

When the Computer Management screen appears, left click on Device Manager

Click the + next to DVD/CDROM Drives to reveal a list of installed drives

Right click each of the installed drives in turn and click Uninstall from the pop-up menu

When this is done click the Action menu and click on Scan For Hardware Changes

The drives will be reinstalled automatically and should now function correctly."

NAT