The 3 Best Ways to Find and Remove Malware in Windows 11

Malware on Windows 11 can show up as pop-ups, browser redirects, slow performance, unknown programs, or security settings that keep changing. The best way to deal with it is to use a reliable scanner, check for anything that hides from normal Windows protection, and remove anything suspicious as safely as possible.

This guide covers three practical ways to detect and remove malware in Windows 11, starting with the built-in tools you already have and moving to stronger options if the problem does not go away.

1. Run a Full Scan with Microsoft Defender

Microsoft Defender is built into Windows 11 and is usually the best first place to start. It can detect common viruses, spyware, trojans, and other unwanted software without needing extra downloads.

1. Open Start, type Windows Security, and open the app.
2. Select Virus & threat protection.
3. Under Current threats, click Scan options.
4. Choose Full scan and then click Scan now.
5. Let the scan finish, then follow any removal or quarantine prompts.

2. Use Microsoft Defender Offline Scan for Stubborn Malware

If malware keeps coming back after a normal scan, or if it blocks security tools, use the Microsoft Defender Offline scan. This method restarts Windows into a special scan mode before most malware has a chance to load.

1. Open Windows Security and go to Virus & threat protection.
2. Select Scan options.
3. Choose Microsoft Defender Offline scan.
4. Save your work, then click Scan now.
5. The PC will restart and perform the scan before Windows fully loads.

This is especially useful for threats that hide in memory, lock files while Windows is running, or try to disable normal antivirus tools.

3. Scan with a Trusted Second-Opinion Malware Tool

If Microsoft Defender does not find anything but your PC still behaves like it is infected, a second-opinion scanner can help. These tools are designed to look for adware, browser hijackers, potentially unwanted programs, and malware that may not be obvious at first glance.

• Choose a reputable tool from a well-known security vendor.
• Install it only from the official website.
• Update its definitions before scanning.
• Run a full scan rather than a quick scan.
• Quarantine or remove anything the tool identifies as malicious or unwanted.

A second scanner is useful because different security products sometimes detect different threats. It can also help confirm whether the problem is truly malware or something else, such as a bad browser extension or unwanted startup app.

How to Check Whether the Malware Is Really Gone

After cleaning the system, confirm that the symptoms are gone and look for anything that might have been left behind.

1. Check Windows Security to make sure protection is on and no active threats remain.
2. Look in Task Manager for unknown startup items or suspicious background processes.
3. Review installed apps and browser extensions for anything you do not recognize.
4. Open your browser and check whether the homepage, search engine, or new tab page has been changed.
5. Watch for recurring pop-ups, redirects, or performance issues over the next day or two.

When Malware Keeps Coming Back

If the infection returns after scanning and removal, the problem may be deeper than a single malicious file. Common causes include hidden browser extensions, scheduled tasks, rogue startup apps, or an account-level infection that comes back after you sign in.

• Remove suspicious browser extensions and reset browser settings.
• Check Task Manager’s Startup tab for unknown entries.
• Review installed apps for software you did not intentionally install.
• Run another offline scan after making changes.
• If needed, back up important files and consider a clean Windows reinstall as a last resort.

What to Do Right After Removing Malware

Once the system is clean, take a few extra steps to reduce the chance of reinfection.

• Change passwords for important accounts, especially email, banking, and Microsoft accounts.
• Turn on two-factor authentication where possible.
• Run Windows Update so security patches are installed.
• Keep Microsoft Defender active and updated.
• Be cautious with email attachments, cracked software, fake downloads, and browser pop-ups.

Which Method Should You Try First?

For most Windows 11 users, the best order is simple: start with Microsoft Defender full scan, use the offline scan if the threat is stubborn, and then confirm the result with a trusted second-opinion tool if symptoms remain.

That approach gives you the best balance of safety, ease, and effectiveness without jumping straight to more drastic measures.