While Windows Defender not working can be easily fixed, having problems with the offline scan indicates an issue that is often tricky to identify. But, we have a few solutions that worked seamlessly for other users. Let’s find out.

Why is Windows Defender offline scan not working?

Here are a few reasons the Windows 10 Defender offline scan is not working:

Bug in the OS: The problem has been reported by a large number of users, which points to a bug in Windows itself. Corrupt system files: If you have corrupt system files on the PC, several critical functioning will stop working, including issues like Windows Defender offline scan stuck. Third-party apps triggering conflicts: Third-party antiviruses and other security software, when installed, can also trigger the problem. Missing permissions: Users require administrative privileges to access certain vital functions and features, and if these are missing, you may find the Windows Defender offline scan not running.

When does this issue occur, and what can I expect?

All types of scans can be impacted (Windows Defender full scan stuck, Windows quick scan not working and, of course, Windows Defender offline scan not starting or restarting) Windows Defender full scan estimated time remaining keeps increasing (users also reported other issues related to full scans such as Windows Defender full scan stopped before completion or it simply crashes on full scan) More issues with the offline option (Windows Defender offline scan stops at 92 or it is taking too long) Windows Defender custom scan not working Scanning is vain (Windows Defender last scan not available/0 files scanned or Windows Defender offline scan no results) Also affecting newer OS versions (Windows Defender offline scan not working Windows 11) Windows Defender offline scan just reboots Windows Defender scan not working in Safe Mode

How can I fix Windows Defender scanning problems?

Before we head to the slightly complex solutions, try these quick ones first:

Make sure you are logged in as an administrator. If you have third-party software installed, Windows will automatically disable Windows Defender to prevent conflicts between the two. So, you can either disable or uninstall the program. Check for any pending Windows updates and install them.

If none of these work, move to the fixes listed next.

1. Perform the scan via PowerShell

Oftentimes, while the Offline Scan wouldn’t start from Windows Defender, executing the dedicated command in PowerShell would get it to run.

2. Run the Windows Update troubleshooter

A few users reported that it was a problem with Windows Update that led to the Windows Defender Offline Scan not working, and running the dedicated troubleshooter got things working perfectly.

3. Use a third-party antivirus

If you still can’t fix the problem with Windows Defender, you might want to consider switching to a third-party antivirus solution. While Windows Defender is a good and free tool, there is another more reliable antivirus software that comes with enhanced features. On that note, we recommend using ESET Internet Security as a very affordable, lightweight, and efficient solution. Surely you’ve heard of ESET since they are a long-established brand in the online security industry, and now their products are even more performant thanks to the latest upgrades. ESET Internet Security offers web browsing protection, and online banking security features, keeping ransomware and spyware attackers at bay. Thanks to its real-time protection technology, this tool will erase all digital threats and further prevent them from entering and affecting your computer.

4. Run the DISM and SFC scan

The DISM (Deployment Image Servicing and Management) tool and SFC (System File Checker) scan are two effective built-in options to fix corrupt system files, which might be the reason Windows Defender Offline Scan is not working.

5. Perform an in-place upgrade

An in-place upgrade is the best option when the Windows Defender Offline Scan is not working or even for other intricate issues where you can’t identify the underlying cause. And the best part is you don’t lose any files or apps, though we do recommend you create a backup beforehand in case things go wrong.

6. Create a new user account

That’s it! If the previous solutions didn’t work, creating a new local user account should do the trick. If you still find Windows Defender Offline Scan not working, reinstall Windows 10 as a last resort. Before you leave, do check the best antivirus for Windows 10 for all-around protection against malware or online threats. Tell us which fix worked for you in the comments section below.

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