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 June 24, 2020 Windows The Ultimate Laptop Buying Guide Tweet Share Email Keeping your Windows 10 installation up to date is of paramount importance if you want to keep your PC safe and secure, and equipped with the best and most modern of features. But when Windows Update fails and you encounter errors like Service Registration is Missing or Corrupt, you can get stuck, unable to protect your system as best you can. Cause of Service Registration is Missing or Corrupt Errors The precise reason for a Windows Update error like this one is often hard to nail down. A new piece of software might be interfering with the update process. You could have a corrupted Windows registry. Or your antivirus 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 is occurring, the solutions are much the same, and it's often easier to fix the problem than diagnose it, so it's best to 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. Windows 10's troubleshooters do an excellent job of fixing most problems, but can at least point you in the right direction when they don'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 your Windows Update error, but it's worth checking anyway. A nasty virus might be trying to prevent your system from being as protected as it can be. If you don't already have antivirus software, you should 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 for some reason or another, the Windows Update service has stopped or doesn't automatically run with Windows. If necessary, you can run through some troubleshooting to restart the service and get it up and running again––and keep it that way! 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 itself. If something has gone wrong with the update portion of Windows, a DISM scan can sometimes fix it. Temporarily Disable Antivirus. This isn't something we'd normally recommend, but if you're still having problems, disabling your Norton, Avast, Windows Defender, or another antivirus temporarily can get you the most needed updates that you're trying to install. Your particular brand of antivirus may be different, but disabling it usually involves the following: Look to the bottom right of your taskbar, near the time and date. Select the small arrow.Look for the icon of your particular antivirus software. Right-click it, or tap and hold. Select to Disable, or shut it down. If asked for admin approval, give it. It is of paramount importance that you then re-enable your antivirus afterward, whether this works or not. With your antivirus application disabled, your system could be at risk for viruses and malware attacks. Reset Windows. If you're still having trouble getting passed that annoying Windows Update error, then you may need to reset Windows entirely. It's not too complicated, but you'll want to make sure you've backed up everything necessary first. Be sure to back your system up entirely before starting this process. You'll have the option to keep your files, but some could still be lost. A complete backup will ensure you can return your Windows installation to the state it was in before the reset if needed.