Hello,
I also couldn't uninstall ESET using the regular methods (gave an error that I can't remove services, even though my account has administrative privileges) but after using the ESET Uninstall Tool in safe mode and reinstalling ESET, it seems to work like a charm. Only thing I noticed during the uninstallation was that the ESET version was marked for Windows 10, other than that don't know what could have caused the problem.
Either way, thanks for your help and hope this helps.