Yep, it's working good until now. Had one cold boot and ZA is running normal.
If I encounter the issue again, I will let you know.
Keep in mind, that it's not enough, to keep other security programs (including virusscanners) inactive. You had to uninstall all 3rd party software if you want to make sure that ZA can install safe and clean.
Hope you'll manage the problem soon.
Update: Second cold boot. No problems so far.