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Problem

You’ve uninstalled the old antivirus and yet it continues to show in the antivirus tab

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Solution

Remnants of the old antivirus are still in the Windows Security Center
  1. Open an elevated PowerShell window
  2. Run the WMI tester command
WBEMTEST
  1. Click Connect
  2. Enter root/securitycenter2 in the Namespace field and click Connect
  3. Now in the _IWbemServices _section, click Query…
  4. Enter ‘SELECT * from Antivirusproduct‘ and click Apply
  5. Double-click the object and scroll down to ‘displayName’ to see the AV name
  6. Delete the old objects