assassin5675 :
But I installed Windows 10 on my hdd that previously Windows 7 without needing a license key, by customisation of the task bar or desktop do you mean:
I can't change the background or add shortcuts to my desktop or task bar because I can do this the Windows 10 that I am on right now that doesn't have a license key.
So, you have Win 10 currently installed on the HDD in this system?
Then no, you do NOT need a license key, nor will it stay 'Unactivated'.
Assuming this system already has a valid Win 10 license and is activated...installing on a new drive does not affect that activation status.
Just install it. When it asks for the license key, skip that and proceed on.
It will activate itself when it goes online later.
Your current Win 10 install DOES have a license...actually a Digital Entitlement, because it was a valid Upgrade from the previous Win 7. It just doesn't have a traditional 'license key' like the old systems did.
What do you plan to do with the OS and data on the current HDD?
What size is this new SSD?