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Already tried to turn off all non-microsoft services, and startup applications. Does not help.

Disabling antivirus does not help.

Same error.

Already checked this. No such service exists.

All this was already done.

Yes tried fresh. iVMS-4200（V3.11.0.5_E). And also tried older versions. Tried many times to install and uninstall. And tried with specific uninstallers to clean everything what is ivms4200, from system disk and from registry. Tried with admin privileges. Windows 10. OS build 19045.4355 , no more...

Trying to install newest ivms 4200, and getting this error - "Npf service installation failed". And now even older versions don't want to install and gives this error. Anyone knows what could be the problem?