T,X

So, that's maybe the reason why it's not detected as a virus.

I suspect that the software changed my MBR when I use it to update the drive(not right after the software's installation)

你可以下载国际版的kaspersky security cloud, 这个有免费版，功能涵盖了KFA

The KIP result says that it is clean, so I have submited a request to reanalyze. Because it did change the MBR of my computer.

The issue is that the KSN trusts the software's setup

Well, this is the nasty software's website: https://www.160.com/, I can't attach it since it's larger than 50MB. The KSC software can't find the threat, but my MBR was changed

I want to add that my computer is double system, including Windows and MAC, so I can't reset MBR use ways that I know.

The system of my computer in windows7 home edition. Not long before my computer got infected by a kind of nasty software that changed the MBR. Therefore, I have to press the enter to make the choice every time when I boot up my computer. I used Kaspersky to scan, but it didn't reporte any threat. Is there anything I can do to make A recovery? Thanks a lot.