Ghost 15 will not recognize my computer hard disk

Very non computer literate individual having trouble with Ghost 15.  Running a Toshiba satellite L775 with Windows 7

In setting up the initial backup schedule, norton will not recognize my C drive.  I can select the destination drive, but the window never proceeds to activate the "OK " button so I can proceed

I don't know if this matters, but in looking for the location for the partfinfo utility, it was located in the directory Program Files (x86), not Program Files.