Windows 10: Do I need a product license key to reinstall Win 10 without a disc?

Hi there,I started with Win 10 preinstalled on my pc, and I made the mistake of upgrading to Win 11. Now I can't use some of the Microsoft Apps such as calculator, snippet tool and when I try to reinstall, it attempt to connect to the app store and then stops. I believe the solution is to reinstall with this but before doing so, I have a few concerns about the product license key:1 Was the original Win 10 license key wiped out by the Win 11 upgrade?2 Will I need to enter the original Win 10 license key? If so, is it possible to do a search to find it in the system?3 If I don't need to enter

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Why was I not asked for a product key when upgrading to Win 10?

According to your spec you have Win 10 Pro, but perhaps that doesn't reflect your PC.

You haven't stated which edition of Win 10 you have on this machine, nor what your Win 10 key is for.

For example, if you already have Win 10 Pro and your key is Win 10 Home, that would be a retrograde step.

For interest only:
Change Product Key in Windows 10

More on product key if you search this list or look at 'Related Tutorials' in the above.
Windows 10 Tutorial Index

 

Reinstall Windows 10 with OEM product key

When you upgraded from a previous version of Windows or receive a new computer preinstalled with Windows 10, what happened is the hardware (your PC) will get a digital entitlement, where a unique signature of the computer will be stored on Microsoft
Activation Servers. The Windows 7 or Windows 8 genuine license you were previously running will be exchanged for a diagnostics key.

Anytime you need to reinstall Windows 10 on that machine, just proceed to reinstall Windows 10. It will automatically reactivate.
You will prompted to enter a product key a couple times through the installation, click I don't have a key and Do this later.

There is no need to know or get a new key, but if you have issues with Digital Licensing or the Activation Troubleshooter, you can utilize an existing Windows 7 or Windows 8/8.1 product key
you already ownto reactivate if necessary. or use the reset function in Windows 10.

Step 1: How
to download official Windows 10 ISO files

Step 2:

• How to: Perform a clean install of Windows 10

 

Windows won't activate a digital license but will with a product key?

Pardon my jumping in... On the first point: Once you have a digital license on a machine, you don't really need the key again. You could simply reinstall Windows using the generic key. Windows then creates a hash that is unique to your computer. It will look on the Windows activation servers to see if that machine has ever been activated before with the same edition of Windows. If it has, it will auto activate. There is no need to transfer any sort of license or even take any action whatsoever. It's just magic *Smile. One the final point, regarding usage of license keys for Win 10 and 11. Just to take that point one step further - If you activate a system with Win 10, you can at any time install Windows 11 as well. You can also go the other way around. If you use a license to install Win 11, you could later decide to install Win 10 instead. Even the generic keys are the same for Win 10 and 11. So, those licenses are truly interchangeable because they are one and the same. Just to illustrate a scenario that is common for me: Let's say that I have a new computer. I typically like to install by doing a fully automated, unattended install. With an unattended install you use a generic key. For example, I will use the Win 10 / 11 Pro generic key. Because generic keys are NOT activation keys, Windows will not activate automatically after installation. I will have to provide a real Win 10 / 11 Pro key to activate it. At that point a digital license is created and stored on Microsoft servers for my system. Once activated, I toss that key, knowing that I will never need it again. Now, assume that I reinstall Windows from scratch again on that same system. If I'm doing an unattended install I provide the generic key (because unattended installation needs some sort of key). If I'm manually stepping through the installation, I simply tell Windows that I don't have a key. I just make sure that I am installing the same edition of Windows (Pro). After installation, Windows checks the Microsoft servers to see if a digital license exists for that machine. If it does, it activates. Note that at no time did I need to reference the original license key or perform any sort of transfer. It just happens automagically. Hope that helps!