Genuine Windows 10 posts 'Invalid Product Key'

  Theodore66 15:55 11 Mar 2018
Locked

Purchased Windows 10 on USB stick from Best Buy Ltd.. Installed OK, then automatic download of required Windows 10 update from Microsoft resulted in extended problems. Now Microsoft tells me that my Product Key is invalid!

  Fruit Bat /\0/\ 18:12 11 Mar 2018

Click Start > Settings > Update & security > Activation > Change the product key then enter the new product key then click Next to Activate

Does it still give problems after re entering the key?

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