Summary

This guide helps you troubleshoot and resolve: Antivirus alerts - what to do. Follow the steps below to fix the issue.

Common Causes

Antivirus Alerts - What to Do - Windows 11

Understanding Antivirus Alerts

What Are They?

Windows Security (built into Windows 11) protects your computer from viruses and malware. When it finds a threat, it will alert you.

Types of Alerts

• Virus detected - Malicious software found
• Threat blocked - Something dangerous was stopped
• Firewall blocked an app - An app tried to access the network
• Suspicious activity - Something looks wrong

What To Do When You See an Alert

If It Says "Threat Detected" or "Virus Detected"

1. Don't panic! The alert may have already blocked it

2. Click on the alert to see details

3. Follow recommended actions:

• Quarantine: Isolate the file (recommended)
• Remove: Delete the file completely
• Allow: Only if you're certain it's safe

4. Run a full scan to make sure nothing else is there

If Windows Deletes a File

• It may have been a dangerous file
• Check your trash if you need to recover it (risky!)
• Better to let Windows keep you safe

If a Program is Blocked

• Was the program trying to access the internet?
• Did you recently install something new?
• If it's a program you trust, you can allow it:

1. Go to Settings > Privacy & security > Windows Security

2. Click Firewall & network protection

3. Allow an app through firewall (if needed)

Running a Manual Scan

Quick Scan (Fast):

1. Press Win + I > Privacy & security

2. Click Windows Security > Virus & threat protection

3. Click Quick scan

Full Scan (Thorough):

1. Same location as above

2. Click Scan options

3. Select Full scan

4. Click Scan now

5. This may take 30-60 minutes

If You Think It's a False Alarm

• Was the file something you downloaded?
• Was it from an email attachment?
• If you're unsure, search the filename online
• You can submit to Microsoft for analysis

Common False Positives

• Some programs that modify system files
• Cracked software
• Very old programs
• Unusual file names

To Check quarantined items:

1. Windows Security > Virus & threat protection

2. Click "Protection history"

3. See what was blocked

Best Practices

• Keep Windows Security turned ON
• Don't install two antivirus programs (they conflict)
• Keep Windows updated
• Don't click suspicious links in emails
• Only download from trusted sources

If You Need Another Antivirus

• Windows Security is usually sufficient
• If installing another, uninstall Windows Security first
• Popular alternatives: Bitdefender, Malwarebytes, Norton

When to Get Professional Help

• You can't remove a threat
• Your computer is acting strangely
• You're not sure if a file is safe
• Alerts keep appearing despite removal

Still Having Issues?