Rootkit Found

Need help.
Recently, Avast gives me a pop-up saying a hidden object has been detected on my system.
I already tried to delete it by running boot time scans twice, but it still appear the next time I boot.
Even when I choose to ignore and check to not tell me in the future, it will appear again.
I already tried using Malwarbytes, Joek, Farbar Recovery Scan Tool, and aswMBR, but the pop-up still appear.
What should I do?

https://forum.avast.com/index.php?topic=194892.0

Malware doesn’t detect anything, I’ve tried to reboot and the avast pop-up appear again.