Software & Apps Windows How to Fix It When Service Registration Is Missing or Corrupt Troubleshooting this Windows Update error by Jon Martindale Writer Jon Martindale has been a feature tech writer for more than 10 years. He's written for publications such as Digital Trends, KitGuru, and ITProPortal. our editorial process Facebook Twitter LinkedIn Jon Martindale Updated on July 14, 2020 Windows The Ultimate Laptop Buying Guide Tweet Share Email Keeping your Windows 10 installation up to date is important if you want to keep your PC safe, secure, and equipped with the best and most modern features. When Windows Update fails, and you encounter Service Registration is Missing or Corrupt errors, you can get stuck and be unable to protect your system. Cause of Service Registration is Missing or Corrupt Errors The precise reason for a Windows Update error like this one is often hard to identify. A new piece of software might be interfering with the update process. The Windows registry could be corrupted. Or an antivirus program might be getting overzealous and blocking a legitimate process in Windows Update. Pixabay How to Fix Windows Update Service Registration is Missing or Corrupt in Windows 10 Regardless of why the error occurs, the solutions are much the same. It's often easier to fix the problem than diagnose it. So, start with the fixes and see what works. Usually, that will tell you the reason for this issue in the first place. After each attempt, reboot your system and try Windows Update again to see if that fixed it. Run the Windows Update Troubleshooter. The Windows 10 troubleshooter does an excellent job of fixing most problems, and it can point you in the right direction when it doesn't. It's always a good call to start with the built-in troubleshooters. Run an antivirus scan. It's unlikely that malware is the root cause of a Windows Update error, but it's worth checking. A virus might be trying to prevent your system from being as protected as it can be. If you don't have antivirus software, consider installing an antivirus solution and run a deep scan of your system as soon as you have it installed. Check the Windows Update Service. It's possible that the Windows Update service stopped or didn't automatically run with Windows. If necessary, run through some troubleshooting to restart the service and get it up and running again. Run an SFC scan. The System File Checker, or SFC, is an excellent Windows tool for rooting out problems with particular files that you might not be aware of. It can also go a long way to fixing Windows Update errors like this one. Run a DISM scan. The Deployment Image Servicing and Management scan is a useful way to repair and fix Windows. If something goes wrong with the update portion of Windows, a DISM scan can sometimes fix it. Temporarily disable antivirus. This step isn't normally recommended. However, if you still encounter problems, temporarily disabling Norton, Avast, Windows Defender, or another antivirus can get you the most needed updates. Your particular brand of antivirus may be different, but disabling it usually involves the following: Look to the lower-right of the taskbar, near the time and date. Select the small arrow.Look for the icon of your antivirus software. Right-click it, or tap and hold. Select Disable, or shut it down. If asked for admin approval, give it. Re-enable the antivirus afterward, whether this works or not. With the antivirus application disabled, your system could be at risk for viruses and malware attacks. Reset Windows. If you still see the Windows Update error, you may need to reset Windows entirely. It's not too complicated, but make sure you've backed up everything necessary first. Back your system up entirely before starting this process. You'll have the option to keep your files, but some could be lost. A complete backup ensures you can return your Windows installation to the state it was in before the reset.