What is ngtool.exe ?

hello
Can anybody explain me what is ngtool.exe ?
It is run by AVAST when I start my computer and uses a lot of performance (70% to 95% of CPU) during a few minutes.
What is its utility ? Is it necessary ? How can I stop this process ?
Gab

Virtual Machine installer, so avast! can emulate malware for better analysis and detection.

Interesting. Which OS is used by this VM ? Does this VM is used temporarly by AVAST when starting the computer or all along my session ? Is it new ?

https://forum.avast.com/index.php?topic=154857.msg1125734#msg1125734