Well, all the computers in the house are on Win 10 except mine. Two went without incident. One was the worst mess I've ever had. It upgraded itself and did fine until it DLed KB.....743, which broke it entirely. I couldn't boot, couldn't reset, couldn't revert to 7, couldn't do anything. Finally, I DLed Win 10 to a DVD, reset the boot sequence and managed to reinstall 10 and lost some apps but no data. On this machine, for reasons I can only speculate on - last floor model, etc. - I cannot get into the boot sequence. Since I can't, I've bought a new, larger HDD and bought a cloner dock. My plan is to clone the Win 7 disk, put the new, cloned disk into the machine and upgrade. If I end up with a mess again, I just put the old HDD back into the computer and revert to Win 7. Criticisms or thoughts?