This is a common problem that can occur with windows 10.
Valid windows 10 product key not working.
Windows 10 loader usually works as windows 10 activator.
Enter a valid windows 10 product key and click next.
If this happens make sure that your activation key is genuine.
Microsoft charges 200 for a windows 10 professional product key.
Microsoft allows anyone to download windows 10 for free and install it without a product key.
Windows 10 activator for example first it is not possible that these keys don t work but still if it happened that key issue.
The system will not prompt you to enter a key if you are upgrading from a genuine version of windows 7 8.
If you encounter it be sure to try to activate your copy of windows 10 again.
Then you can use windows 10 loader to activate windows 10.
Windows 10 will be the most used operating system which is released in back july 2015 if you have problem with your current running windows 10 in your system and want to repair or re install windows then you need have windows 10 product key or serial key.
The most notable being that windows 10 is free for existing windows 7 8 8 1 users for the first year.
That s a huge savings but don t fall for it.
Type slui and click ok.
And you can even pay to upgrade to a licensed copy of windows 10 after you install it.
It ll keep working for the foreseeable future with only a few small cosmetic restrictions.
Microsoft allows all valid users to freely upgrade to its latest version of operating system without spending a dime.
How to activate windows 10 if windows 10 product key does not work.
Regardless of this product activation remains a part of windows 10.
Press the windows key r on your keyboard to open run.
Windows 10 product activation keys.
Windows 10 product key doesn t work.
You can change the product key in the registry anytime you wish.
Sometimes your product key won t work on windows 10.
But with a quick search online you can find websites promising windows 10 pro keys for 12 or even less.