Hi, The only thing worth checking given the logs you've found (if they are later versions) is that the error message is the same. i.e. you see in the MSI log the error: StartService: StartServiceW failed with errorcode : 1053 Before you run the install could you check the following points as it's interesting you say it has been installed on this computer before: 1. Run: services.msc to launch the service control manager MMC snap-in. Hopefully the services: Sophos MCS Agent Sophos MCS Client Do not already exist? Could it be the services are already present before the install starts which is affecting the install? If they do, maybe forcing a removal of them might be required. I would always suggest try the MSIs first to do so I would suggest following: https://www.sophos.com/support/knowledgebase/122126.aspx I.e. create a batch file with the commands mentioned, e.g. uninstall.bat, the right click on it and Run as Administrator. If that still fails to remove the services, then you could run (in an administrative command prompt) the commands: sc delete "Sophos MCS Agent" sc delete "Sophos MCS Client" This will remove the 2 services using the command line interface to the Service Control Manager. Not an ideal approach but at some point you may have to go down this route if this is the problem. 2. The directory: C:\Programdata\sophos\ already exists which is causing an issue. If so, are you able to remove that before installing. If you find it's stubborn to remove, I would suggest reboot first, failing which try a rename of the directory. Hopefully this helps. Regards, Jak
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