Got the same error. However, I found a workaround that allows you to work with Win10 Insider Preview 14926 AND fully functional Parallel Tools.
Reboot the VM containing build 14926 with reinstalled Parallel Tools; this causes BSOD, but system enters Repair Mode after an iteration or so. Now select Advanced Options | Troubleshoot | Advanced Options | Startup Settings | Restart, and subsequently choose "Enable low-resolution video". The system duly boots in lo-res, but the proper resolution kicks in as soon as the logon screen appears; after this, the system will run stably. If you enable the Boot option "Base video" in msconfig, you can restart the system at leasure from then on.
The error is being investigated by Parallels Support.
Update 25 September: Win 10 Insider Preview 14931 doesn't have the problem--must have been a bug in 14926...
Last edited: Sep 25, 2016