Ich habe gerade einen Windows 11 Pro-Schlüssel von https://digitlogs.com/product/windows-11-professional-retail-license-key-32-64bit/ für 13 € gekauft und er wurde erfolgreich aktiviert.

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It sounds like your previous installation of Windows was linked to your old motherboard through a digital license. When you change hardware, especially the motherboard, it can cause Windows to require reactivation. Normally, the license for Windows is tied to your device, and after a reset, you could still reinstall without needing a product key because it recognized the hardware.

However, now that you've installed a new motherboard, your PC no longer recognizes it as the same device, which is why you're being prompted to enter a product key. Unfortunately, Windows will treat this as a "new device," and you'll need to activate it with a valid key.

Since you mentioned that you're on a budget, one affordable option is to purchase a legitimate Windows 11 Pro key from This website at a discounted price. You can check it out here: Windows 11 Professional License Key.

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I've used this site to buy Office 2021 Pro Plus a few times over the years and never had a problem:

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you can find Windows 11 Pro keys for under 20 dollars on reputable third-party websites, such as Digitlogs, where competitive prices and instant key delivery are offered.

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