My system update from 8.1 Pro/64 to Win 10 fails with the error message C1900101-20017 ("The installation failed in the SAFE_OS phase with an error during BOOT operation"). I have tried every suggestion I could fine on this error - mostly for systems trying to update to 8.1 or the beta version of Win10. I have removed or disabled all my external USB devices (two HD and a film scanner), tried to install from a clean boot, repaired the windows update service, enabled the superfetch service (not needed because I have a SSD C: drive), increased the size of the Startup Event Trace Sessions (because I saw an even with an error about this), etc. Nothing works. I would do a clean install, but the only way to get a valid license key for Win 10 is to do an update. I also tried downloading the install software ISO and have tried installing from that image - with the same result.
I am at a dead end. Is MS cognizant of this issue and researching it? Is there any hope that that this issue will be addressed specifically and/or the install routines modified to deal with this situation?
I'm hoping for some official or semi-official comment from MS about this issue.
Note: I was offered the Win 10 update on the 29th though I am not in the beta program (fast or slow rings) - which was surprising. Maybe I jumped too soon, but everything I have seen indicates that the update software is ready to go.