Hi,

One of the laptops hard drive has failed and I need to reinstall the OS on a new drive. Issue is I have no idea what key that machine was using. I still have all the keys but didn't record which machine had which.
I appreciate that I have missed the free upgrade window, but Win 7 will be fine for this machine. I assume though that I shouldn't use a key that is already in use with one of my other machines?

Please help.

I didn't find the right solution from the Internet.

References:
https://forums.overclockers.co.uk/threads/re-install-windows-which-licence.18819149/
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Thanks