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You can start a scan for malware any time you like.

Note:  Microsoft Defender currently offers anti-malware on Windows, Android, and macOS.

From the Microsoft Defender dashboard

The Microsoft Defender dashboard on Windows

  1. Select Device details

  2. Select Manage in Windows Security

  3. Select Quick scan


    • If you want a deeper scan, instead of selecting Quick scan in step 3, select Scan options and choose the type of scan you want.

    • For the most complete scan, run Microsoft Defender Offline. For more about that see Help protect my PC with Microsoft Defender Offline.

From the Microsoft Defender dashboard

  1. Tap Device details to go to the Device protection screen

  2. Tap Malware protection

    The Device protection card in Microsoft Defender on Android showing the Malware protection section highlighted.

  3. Tap the Scan button

From the Microsoft Defender dashboard

  1. Select Device details

  2. Select Start scan

  3. Select the type of scan you want to run, then Start scan.

When the scan completes, Defender will tell you if it found anything. 

When would I want to run a scan?

If you suspect your device may be infected, or if you want to confirm that a previous infection appears to be cleaned, you should have Defender start a scan.

Signs that your device might have malware include:

  • Suddenly running much slower than usual

  • Significant decrease in battery life

  • An unexpected increase in data usage

Any of those symptoms may indicate that an unknown process is running in the background and consuming your device resources.

Other clues include:

  • Unexpected ads or pop-ups

  • Getting redirected to totally different sites when trying to browse the web

Learn more

How malware can infect your device

Microsoft security help and learning

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