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There can be various reasons why the removal of software with an NSSM service fails during uninstallation. Here are some possible reasons:

1. The NSSM service may still be running or in use by other applications. In this case, you should stop the service first before attempting to uninstall the software.

2. The software may have multiple components or dependencies that need to be removed first before the NSSM service can be uninstalled.

3. There might be issues with the registry entries or files associated with the NSSM service, preventing its successful removal. In this case, you may need to troubleshoot the registry and file system manually or seek help from the software vendor.

4. Antivirus or security software could be blocking the uninstallation process, either by identifying the NSSM service as a potential threat or by preventing changes to critical system files. Try disabling your antivirus software temporarily and see if it allows you to uninstall the software.

5. The software might not have been installed correctly, leaving behind fragments that hinder its removal. You may need to use a third-party uninstaller tool or consult the software vendor's support team to troubleshoot the issue.