syshost.exe, what is it?

Hello avast forum, recently when waking up from bed, and booting up my Laptop i got a popup saying that do you want to run this as administrator (i think its the syshost.exe)? I clicked no. But it kept coming back. So i clicked yes.

1 minute later, all my windows closed and i got bsod. Oh how scared i was :cry:

But when it booted up, avast detected syshost.

What is the file and how do i remove it? Avast takes forever to delete the file. Please, iā€™m so scared :cry:

Attach your basic diagnostic logs. (MBAM, FRST and aswMBR)
Instructions: https://forum.avast.com/index.php?topic=53253