The camera driver/software might got corrupted or conflicts with other/ third party applications.
What you can do is to try reinstalling the camera drivers and software from the link below
http://esupport.sony.com/US/perl/swu-list.pl?mdl=VGNSZ460NC
the camera drivers/software are listed under
Camera - 4 file(s)
Be sure to install everything under that category. Start from bottom to top.
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