Your anti-virus may have removed the Zenstate file. I am using Symantec myself and have to restore the files from quarantine and then exclude them from future scans. This has to be done for every new version of Zenstate. Different anti-virus software will behave differently on this.
I am running with no antivirus at the moment Avast has been promoted to the recycle bin for behaving more like a virus than any virus.
But yes Avast was being overly intrusive the first times I tried installing. "the zenstate file" you mention should be replaced with a new install, surely.
Are you saying the antivirus has deleted some part of windows or just "the Zenstate" file. I have reinstalled many times, its just f%&^ed and I am getting a bit narky with the whole deal.
CeltPC I have tried your suggestion too but no joy.
Edited by dorbot - 5/6/17 at 2:07am