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Do You Need Webroot If Microsoft Defender Is Installed? | Security Guide

Natalie Taylor Sep 29, 2026 869 views

Question details

The user wants to know if it is necessary to install or keep Webroot Antivirus active when Windows already provides real-time protection via Microsoft Defender.

Do You Need Webroot If Microsoft Defender Is Installed?

Product: Microsoft Defender / Webroot
Device & OS: Windows 10 / Windows 11
Scenario: Deciding whether to use a third-party antivirus alongside Windows built-in security to optimize protection and performance.
Observed behavior: Running multiple real-time antivirus programs simultaneously causes software conflicts, high CPU usage, and degraded system performance.

Before you start

Before making changes to your security software, check your current Windows Security settings to verify that at least one real-time antivirus protection provider is actively running and up to date.

Solution 1Recommended

Choose and Enable a Single Primary Antivirus Solution

To prevent system conflicts and performance drops, avoid running Webroot and Microsoft Defender's real-time protection simultaneously.

Microsoft Defender provides robust, built-in real-time protection for Windows 10 and Windows 11. Installing Webroot alongside it is generally unnecessary for everyday use. When both programs attempt to scan the same files simultaneously, it leads to software conflicts and significantly reduces your PC's performance.

You should decide which software best fits your needs and disable or uninstall the other.

Check Windows Security Status

Open the Start menu, type 'Windows Security', and press Enter. Click on 'Virus & threat protection'.

Verify Your Active Antivirus

Under the 'Who's protecting me?' section, click 'Manage providers' to see if Microsoft Defender or Webroot is currently managing your real-time protection.

Uninstall Unneeded Software

If you decide to rely solely on Microsoft Defender, navigate to 'Settings' > 'Apps' > 'Installed apps'. Locate Webroot SecureAnywhere in the list, click the three dots, and select 'Uninstall'.

Verify Defender Real-Time Protection is Active

Once Webroot is completely removed, return to Windows Security > 'Virus & threat protection'. Click 'Manage settings' under Virus & threat protection settings, and ensure the 'Real-time protection' toggle is switched to On.

Automatic Transition: Windows is designed to automatically re-enable Microsoft Defender's real-time protection as soon as a third-party antivirus like Webroot is uninstalled or disabled.

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Frequently Asked Questions

Does installing Webroot automatically disable Microsoft Defender?

Yes, in most cases, Windows 10 and 11 will automatically turn off Microsoft Defender's primary real-time protection when it detects a recognized third-party antivirus like Webroot. This is done specifically to prevent system conflicts.

Is Microsoft Defender good enough on its own without Webroot?

For the vast majority of home users, Microsoft Defender provides excellent, comprehensive protection against viruses, malware, and ransomware without the need for additional paid software like Webroot.

Can I use Microsoft Defender for periodic scans while keeping Webroot active?

Yes. Windows Security allows you to enable a feature called 'Periodic scanning' in the Virus & threat protection settings. This lets Microsoft Defender occasionally scan your device for threats even while Webroot acts as your primary real-time antivirus.

How do I know if my PC is suffering from an antivirus conflict?

Symptoms of running conflicting antivirus programs include severe system lag, high CPU or RAM usage even when idle, files taking a long time to open, and frequent system freezes or crashes.

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