Question: how to manually uninstall nxlog?
Answer: Uninstalling with msiexec. Uninstall NXLog using msiexec with the following command: ... 
Uninstalling via Group Policy. For Group Policy deployments, follow these steps: ... 
Remove the Traces of NXLog. After uninstalling NXLog there will be some traces left in the Windows Registry. ... 
Uninstalling With the uninstall-x64. bat Script.