Welcome to the forum.
Not sure if PrE 7 had added Webcams, in Edit>Preferences>Capture, but look there to see if the Toshiba is recognized. The Webcam, if properly setup should appear in Get Media, Camcorder..., Webcam.
If you cannot do Capture directly into PrE 7, you can always use the Toshiba Capture Utility, and just set it for a file format/CODEC, that will match your Project Preset. Just Import that resultant file into PrE.
PS - some Webcams are detected just fine, but some are not.
Message was edited by: Bill Hunt - Added PS