Windows Defender won't turn on or stays disabled
When Defender won't turn on, it's usually because a group policy or another antivirus is blocking it. Disabling the policy or the other antivirus lets you turn Defender back on — this usually takes just a few minutes.
Windows Defender has built-in safety features to prevent conflicts with other antivirus programs. Sometimes a policy gets stuck or another antivirus is blocking Defender from running. We'll check what's blocking it and remove the block so you can turn Defender back on.
- ✓Make sure you're logged in with an admin account
- ✓If you have another antivirus installed (like Norton or McAfee), have it ready to uninstall if needed
- ✓You may need to restart your computer after this fix
Fix-IT-Bot will walk you through each step, just tap, no typing needed.
Skip, I just want a technicianCommon mistakes to avoid
- Installing two antivirus programs at the same time — Windows will disable Defender to prevent conflicts.
- Not restarting after removing another antivirus — the change doesn't take effect until you restart.
Signs you need professional help
- If Windows Defender is still off after trying all these steps, or if you see a message saying your computer is managed by an organization, get in touch — your workplace may have locked this setting.
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