Hi dllhotka,
we're using Trendmicro Worry-Free Business Security Advanced. We've made an update to the latest Versions yesterday and I've uninstalled the old antivirus client and reinstalled the new version (instead of an autoupdate).
I would really dislike to run the VM without any antivirus protection - it's windows, not Mac OS 
.
But maybe we can switch to another antivirus solution (just for testing).
Bye
Nils