I experience the same on 6.6.x EES. After last build 17713 HIPS stopped working. On some build before, do clean install fix the issue. I try to manual find any leftover file with ESET certificate and wasn't find any, specially after ESET uninstall tool. No file or driver leftover conflict. This week will get update to Windows, let's hope this will fix issue.
If can help, after install HIPS, Anti-Stealth and Firewall modules doesn't install and work properly. So the problem itself, it's not only about HIPS. It's ESET to be behind MS, can't you make ESET OS independent? I mean program and it's cores to install in way, that OS can't prevent them? I mean before last 17713 ESET goes long time with no HIPS or other driver problems.
I try AVG Internet Security, as activate full 60 trial, and program install itself in Security Center as Firewall and Antivirus just right, and actually have more graphic visuals in Windows Security center, than ESET. It was just for test, because I think Windows Defender Firewall is the issue, but wasn't.