How to Do a Full Virus and Malware Scan on Windows PCs

We’re often asked about the most thorough way to scan for viruses & malware. While Windows includes basic virus protection, a complete security check requires multiple specialized tools to detect different types of threats. Here’s our comprehensive guide to performing a thorough virus and malware scan.

Step 1: Windows Defender Full Scan

Initial System Check

• Open Windows Security from Start menu
• Select Virus & threat protection
• Choose Scan options → Full scan
• Allow scan to complete (may take several hours)

Scan Options

• Enable cloud-delivered protection
• Turn on real-time protection if disabled
• Update virus definitions first
• Consider offline scan for persistent threats

Step 2: Rootkit Detection

Specialized Scanning Tools

• Download reputable rootkit scanner:
  • GMER
  • TrendMicro RootkitBuster
  • Sophos Virus Removal Tool
• Run as administrator for full system access
• Scan all drives including hidden partitions
• Remove detected rootkits if found

Step 3: Adware Cleanup

Using ADWCleaner

• Download ADWCleaner from official Malwarebytes site
• Run scan and review results
• Clean detected items
• Restart system when prompted

Step 4: Malware Detection

Malwarebytes Free Scan

• Install Malwarebytes Free Edition
• Update definitions and run full scan
• Remove detected threats
• Consider uninstalling after scan to avoid promotional popup messages

Step 5: Offline Scanning

Portable Scanner Options

• Microsoft Safety Scanner or Emsisoft Emergency Kit
• Run from USB drive for clean environment
• Scan system while Windows isn’t running
• Remove persistent threats that hide during normal operation