Hi, Everyone, a friend of mine has had trouble with his laptop recently, he had upgraded it from windows 8 to windows 10 a long time ago and says it has been buggy and running slow ever since, after much messing about I did a factory reset which has taken his system back to windows 8. I am just curious to know if I can still put windows 10 back on it for free. I did not do the original upgrade but he says he had numerous programs (including kaspersky antivirus) which just disappeared after the upgrade. I would like to do a fresh install of windows 10 but I am worried that if it does not work I will not be able to put windows 8 back on, and he will be left with no operating system. Any advice would be much appreciated thanks