In many cases, third-party uninstallers are not able to remove all traces of the application. The uninstall registry key of the third-party anti-virus application is often left during the uninstall. As a result, the Sophos Competitor Removal Tool (CRT) detects this remnant.
Ideally, the CRT is expected to successfully remove the third-party anti-virus. For instances wherein the Sophos installation fails due to the CRT failing to uninstall the existing anti-virus, this article will provide information on how to resolve this. The following sections are covered:
Applies to the following Sophos products and versions Central Windows Endpoint 10.8.1
This scenario normally happens when the installer of the third-party anti-virus was not fully uninstalled and there are traces that CRT can still detect.
Note: It is highly recommended to back-up the registry first before doing any changes in the registry.
Before performing the steps below, disable any tamper protection on the third-party anti-virus that possibly stops the CRT from uninstalling it then retry the uninstall. If this still does not resolve the issue, perform the following steps:
No products detected on this system
Note: The previous lines in the log file show all registry keys that the CRT has checked to identify the third-party anti-virus. This helps in identifying why the product was not detected.
AVRemove.exe --listproducts > crtproducts.txt
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