simonchipmunk :
Ranjha: if I understand your posting, you are advising Nitas to install Windows 10 and use Microsoft account before you do a clean install.
that doesn't make sense to me. the end result is that the program is installed twice.
simonchipmunk
That's what i thought before instlaling windows 10 for 1st time but remember when installing windows you have option of deleting all the previous installations that's what he will do that's the only way to do clean install of windows 10 right now
First Install from inside the Windows 7 or 8 converts the key to Windows 10 using a usb drive(make sure to login with Microsoft Account and activate the Windows).
2nd Install will give him option to delete all the partitions and do a complete clean installation by installing all the partitions will remove all the stuff from previous installation and old windows 7/8
Key conversion has to take place in order for his windows to be legal and activate and 1st installation using Usb to install and signing with Microsoft Account(MSN) will attach the key to Microsoft account and Motherboard that he will sign with that way Microsoft knows which person is legal and which computer to activate
1 Windows 7/8 key=1 Windows 10 key
During Installation When it asks for Key Skip after you login into the computer go to windows update and activation and it will activate the Windows for you(if it fails 1st time give it couple of restarts and try it couple of times it will eventually activate Don't Panic)