Problem code 68

After using Parallels without a problem on my Retina display MacBookPro for about a year, I have recently updated Parallels. Also, I my computer restarted unexpectedly yesterday. Today, when I try to start Parallels 8 (Build 8.0.18608, revision 898384), I consistently get Problem Code 68. I have followed all the steps suggested at: http://kb.parallels.com/en/9231.

Two permission errors were corrected by Disk Utility. I added Parallels Desktop as an exception under Sophos anti-virus. I reinstalled Parallels 8, and I rebooted. I also added "vm.app_mode=32" as a boot flag.

Unfortunately, after permission repairs, reboots, and Parallels reinstalls, I still get the same Problem Code 68.

I do have automatic back-up software, so I can likely "roll back" any particular file to a prior version.

Any suggestions?

MacBookPro
Retina, Mid 2012
2.6 GHz Intel Core i7
16 GB 1600 MHz DDR3
Intel HD Graphics 4000 512 MB
OS X 10.8.4 (12E55)
448 GB free out of 750.08 HB