is the virus gone

A Microsoft Defender alert no longer appearing is a good sign, but it does not confirm by itself that the malware is fully gone.

Use this check path:

1. Open Windows Security by searching for it from Start.
2. Select Virus & threat protection.
3. Make sure Microsoft Defender Antivirus is active and not replaced by another antivirus product. If a non-Microsoft antivirus is installed, Defender can be in passive mode or disabled.
4. Under Virus & threat protection settings, select Manage settings and make sure these are On:
   • Cloud-delivered protection
   • Automatic sample submission
5. Under Virus & threat protection updates, select Check for updates, then under Threat definitions select Check for updates.
6. Run a scan from Virus & threat protection.
7. If the threat was previously reported as only partly removed, run the Malicious Software Removal Tool:
   • Press Windows key + R
   • Run %windir%\system32\mrt.exe
   • Follow the prompts to scan and clean the PC
8. If the same malware comes back, run Windows Defender Offline scan:
   • Start > Settings > Update & Security > Windows Security > Virus & threat protection
   • Under Current threats, select Scan options
   • Select Windows Defender Offline scan > Scan now

Important:

• Running more than one antivirus or antispyware program at the same time can reduce performance and make the PC unstable.
• If another antivirus was installed for cleanup, uninstall it after use unless it is intended to be the main antivirus.
• Before removing another security product, make sure Microsoft Defender Antivirus is enabled.

If suspicious files are still present but not detected, submit the files to Microsoft for analysis.

References:

• Troubleshoot problems with detecting and removing malware | Microsoft Support
• Antivirus and antimalware software: FAQ | Microsoft Support
• Protect my PC from viruses | Microsoft Support
• Microsoft Defender Antivirus in the Windows Security app
• Microsoft Defender Antivirus in Windows Overview