How to Fix Windows Defender Quick Scan Not Working

Microsoft Defender Antivirus is built into Windows 11 and helps protect against malware, including viruses, ransomware, and spyware. It has a Quick Scan feature that checks the locations where malware is most likely to hide. It’s useful when you want to check your PC without running a Full Scan, which examines every file and program on the device. This is the recommended scan function, as it doesn’t take as long as a Full Scan but is designed to offer a good level of protection.

Unfortunately, some Windows 11 users have discovered Windows Defender Quick Scan not working; it either stops partway through or won’t run at all.

Try these troubleshooting steps to get your MS Defender Quick Scan working again.

Windows Defender Quick Scan Not Running: Initial Checks

Step 1. Before you try any fixes, check that you’re using the correct process to run a Quick Scan. Go to the Start menu and search for Defender.

Step 2. Select Device protection.

Step 3. Now click Manage in Windows Security.

Step 4. This will take you to the Windows Security screen, and you should be on Virus & threat protection. If not, you can select this from the left-hand menu. Once you see this page, click on Quick scan to see if the feature works.

Step 5. The scan should start running, with an estimated time to complete. This is usually less than two minutes, but this change depending on how much data you have stored on your Windows 11 machine.

If this doesn’t work, restart your computer and try again. Sometimes this will fix the problem, but not always. If the problem continues, check whether another antivirus product is active. In Windows Security, go to Virus & threat protection and select Manage providers under ‘Who’s protecting me?’.

If you see something like:

• Norton
• McAfee
• Kaspersky
• Avast
• Panda

Or another known antivirus provider, right-click on the icon and press “Exit” or “Close.” You can always reactivate it after the Quick Scan has completed, if you wish.

Windows Defender Quick Scan Not Working: Check for Virus Protection Updates

Step 1. If Microsoft Defender Antivirus isn’t up to date, installing the latest protection updates can help ensure that it has the latest security intelligence, engine, and platform updates.

Step 2. Click Protection updates, then the gray Check for updates button. Sometimes, automatic updates fail to download, and this should ensure all the latest patches and bug fixes are in place.

Step 3. Allow Windows to complete the update check and follow any on-screen instructions.

Step 4. You may now see that a new update has been installed and the “Version created on” date has changed. Restart your machine, and you should be able to use your Quick Scan as normal.