To me...you are asking "can I fix this" when you don't have any idea what needs fixing...and you don't have the tools to fix it, anyway
If it were me, I'd wipe it, do a clean install and go forward...after I had properly run the appropriate hard drive diagnostic.
Whatever restore-to-defaults was intended for user-employment by Sony...I'm sure that it relied upon a hidden partition and/or the disks that were never made.
Vendors like the following might be the best approach, http://www.gennersales.co.uk/reimagevista/sonyvaiovgn-nr21zvistarecovery.htm
, especially if user is tied to Vista/installed apps and does not backup. I myself would never go that route, but there's (obviously) quite a market for these vendors selling recovery CDs that system manufacturers no longer supply.