Once its activated once you can do whatever you like regarding complete re installs. I personally only leave one drive connected when installing the operating system to ensure that the boot records and everything else can only go on that drive 

hmm interesting, Wonder if it will deactivate your laptop if it does activate. Please let us know so i can put it in the faq![]()
Right click your C drive > properties > disk cleanup > click the clean system files > Tick all old installs and ok it.
Here's an important one:
How to get the start screen back (for those of us not trapped in 1995)
Settings > Personalization > Start
Toggle "Use Start full screen" to on.
Simple![]()
@kool not sure if serious? It turns it back to windows 8 start.
I've tried just about everything and cannot get Cortana to work, All I get is this setting restricted due to your region. I live in the UK have every think that I can think of set to he UK but it still doesn't work, installed all the packs I can find relating to the UK. Even tried setting to the USA but nothing, so any help greatly appreciated.