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Peronally after uninstalling old versions, cleaning up registry entries, and deleting temporary files, restarting, etc. I would reimage the two machines and try again if still struggling.
Not an option, ones a production server. There we no older version installed.
It's your only option (manual uninstall and clean up). There's no magic way to fix some of the issues other than that.
Remove the epo agent first with the command:
then uninstall the Antivirus client.
Clean up the program folders if any are left over. If it tells you some files can't be deleted, you're going to need to restart the server.
Also remove registry entries left over before reinstalling.
then start all over.
8.7i probably performs the same function as Defender does, so there's no point in doing both at the same time. It's common for a lot of virus clients to disable Defender.
I had this happen to one of my machines today. I'm not using EPO, at least not yet. I'm in the process of upgrading Protection Pilot to EPO due to McAfee ending PRP next summer. I was installing 8.7 manually as the domain admin and received a permissions error when the install was trying to start the services. The computer is running XP Service Pack 2. I closed out of the error and rebooted the machine. I was then able to install 8.7
Im sure there was an issue with a legacy filter driver still referenced in the registry after 8.5 removal that blocked 8.7 install, cant find the thread though.
I will try and have a go with the removal and reboot etc, the 'not an option' comment was in reference to reimaging the machine, that's not possible with this server.