How to start a scan for viruses or malware in Microsoft Defender
If you suspect that your device may have malware you should have Microsoft Defender run a scan. Here's how to do that on Windows, Mac, or Android.
Virus and Threat Protection in the Windows Security App
Learn how to use virus and threat protection options in Windows Security to scan your device for threats and view the results.
Stay Protected With the Windows Security App - Microsoft Support
If you suspect there's malware or a virus on your device, you should immediately run a quick scan. In the Windows Security app on your PC, select Virus & threat protection > Quick scan or use the following shortcut:
Scan an item with Windows Security - Microsoft Support
Windows Security (Windows Defender Security Center in previous versions of Windows) enables you to scan specific files and folders to make sure they're safe. You'll be notified immediately if any threats are found.
Schedule a scan in Microsoft Defender Antivirus
Learn how to schedule a Windows Defender Antivirus scan at a time and frequency that you choose.
Troubleshoot problems with detecting and removing malware
To start an offline scan in Windows: Select Start > Settings > Update & Security > Windows Security > Virus & threat protection. Under Current threats, select Scan options. Select Windows Defender Offline scan and then select Scan now.
Remove malware from your PC in Windows 8.1 or Windows 7
Windows Defender and Microsoft Security Essentials are powerful scanning tools that find and remove malware from your PC. Here's how to use Windows Defender in Windows 8.1 or Microsoft Security Essentials in Windows 7 to scan your PC.
Microsoft resources and guidance for removal of malware and …
Microsoft Safety Scanner. If you think your computer is infected, we recommend that you run the Microsoft Safety Scanner. The scan is free and will detect and remove many of the issues that customers frequently contact us about. To run the Microsoft Safety Scanner, visit the following Microsoft webpage: Microsoft Safety Scanner
Protect your PC from ransomware - Microsoft Support
Use antimalware programs, such as Windows Security, whenever you’re concerned your PC might be infected. For example, if you hear about new malware in the news or you notice odd behavior on your PC. See Virus & threat protection in Windows Security for how to scan your device. If you actually get a ransomware infection
Use the System File Checker tool to repair missing or corrupted …
When critical Windows system files are missing or corrupted, some Windows features may stop working correctly or Windows may stop responding altogether. If this happens, you can use the Deployment Image Servicing and Management tool (DISM) and the System File Checker tool (SFC) to scan your system files and restore any corrupted or missing files.