Frustrated here, I've done a million of these but for some reason its not working here for me. I have a Toshiba e45 b4100 with win 8.1. Everytime I try to do a in place upgrade to win 10 I get "Windows 10 Installation has Failed" I found security center was corrupted and AVG was on it, uninstalled, cleaned with removal tool, sfc, chkdsk, clean boot, I did a in place reload of 8.1, now everything is fine. I try the upgrade again from my known good windows 10 installer usb, same error??? ideas?