Ucchedavāda;195221888 said:You'll probably have to do a clean install of Windows 7 first, and then upgraded from there. There may be a way to skip directly to doing a clean install of W10, but from what I know you need to go through the upgrade process in order to "convert" your W7 license into a W10 license. After you've done that, then you can retrieve your W10 key and do a clean install of W10 if you so desire.
When I installed it on my laptop from work it came straight from Lenovo with Windows 8 and when I upgraded I noticed a third option (which I haven't seen before) that said it would wipe the computer and I'd lose all my files. I did that option and it gave me a fresh install with no lenovo software on it. So perhaps he should try that.