I bought a Lenovo Thinkpad L520 from a a member of this forum last week (scootre) and it arrived yesterday (the thing looks and runs like a brand new laptop) so i have to thank him for this. I bought this for my daughters friend to use because she smashed her toshiba laptop screen, and it had been reverted back factory Win 7 pro, so i did the updates, it got the win 10 upgrade notification during the updates, and i have now tried to upgrade to win 10 3 times, using my win 10 iso to launch it, and everything was ok during the initial setup stage while still on the win 7 desktop, it got all the updates required, i chose to wipe everything, and when the laptop did its first re-boot, it starts booting, and stops/hangs at the first win 10 logo and won't go any further, so i press the power button to shut down, and on restart, it loads up on the windows 7 OS, and then i get a screen with a box telling me the upgrade failed, due to a SAFE_OS Phase error during boot (code 0xC1900101-0x20017) Tried it 3 times, fails each time ???? I used the same win 10 ISO (build 10586) on a bootable USB stick to launch the upgrade from the win 7 desktop, as i had done with 3 other laptops yesterday which worked fine, so i am going to launch the upgrade from the icon in the taskbar this time, so it will download the setup files onto the actual laptop and see if that works. glad i just got my new NBN setup last week.