Software & Apps Windows Error Code 0x803f7001: What It Is and How to Fix It What to do when you get this Windows error by Gabriel Moss Writer Gabriel Moss has been writing about technology since 2017. His work has appeared in IGN, Road to VR, Fanbyte, UploadVR, VRScout, VR Fitness Insider, and more. our editorial process LinkedIn Gabriel Moss Updated on June 12, 2020 Windows The Ultimate Laptop Buying Guide Tweet Share Email When you upgrade to Windows 10, you might run into an error message like the following: We can't activate Windows on this device because you don't have a valid digital license or product key. Go to the store to buy genuine Windows. Error code: 0x803F7001. Windows error code 0x803F7001 results from a bug that can occur when you first activate Windows 10 or upgrade from a previous version of Windows. Instructions in this article apply to Windows 10. Unsplash What Is Error Code 0x803f7001? If you see error code 0x803f7001, it means that your copy of Windows 10 isn't registering in Microsoft's database. The error occurs when Windows doesn't have a valid registration key on file for the device. There are several other reasons this Windows 10 error code could appear: The system didn't have enough time to communicate with the Microsoft database.You haven't registered a Windows 10 license key at all.You're operating a counterfeit version of Windows 10.SLUI ran into an error during activation (if the Windows 10 license key was activated through SLUI).You upgraded the system hardware significantly enough to confuse Windows into believing that you're on an entirely new, unregistered machine.You attempted to install Windows 10 on a second machine, and now this machine is no longer recognized as active in the Microsoft database.A virus or other malware attacked the Windows Registry.There's an error in the Windows Registry.The operating system version is out of date.The system drivers are out of date or not properly installed. If you have a counterfeit copy of Windows 10, this error continues appearing until you purchase and activate a legitimate copy of Windows 10. How to Fix the Windows 10 Activation Key Won't Work Error Code Try these fixes in order until you can successfully use Windows 10: Check the internet connection. You need a solid internet signal to register the operating system. Make sure you give the machine enough time to communicate with the Microsoft database. Re-register your Windows 10 license key. If you bought a new computer with Windows 10 installed, the key will either be in a documentation file or physically located somewhere on the computer case. On a laptop, it may be located somewhere on the device's underside. If you purchased a separate copy of Windows 10, the license code will either be on the back of the physical packaging or inside an email if you purchased Windows 10 digitally. If you upgraded from Windows 8 or Windows 7, the Windows 10 registration key is the same one that you used for either of those operating systems. If that doesn't work, downgrade back to the previous version of Windows, activate your key again from there, and attempt to upgrade to Windows 10 again afterward. You can only have one device registered to one Windows 10 product key at a given time. Scan the PC for malware. Use Windows Defender or another free antivirus program to run a complete security scan. Run Windows Update. If possible, check for Windows updates to download any recent patches from Microsoft that could fix the problem. Update the drivers. Out-of-date device drivers can cause all manner of errors, including error code 0x803f7001. Clean the Windows Registry. Use a free registry cleaner to remove old and corrupted entries from the registry that could cause errors.