how to delete

hi everybody!

Yesterday i was updating the gom player, and during install i got this pop-up in thai language (i live in thai) which i couldnt understand, i clicked whatever button and avast got installed on my system… im using kaspersky so i dont need that, now i have difficulties uninstalling avast:
I cannot uninstall it via control panel
I cannot kill the process in the process manager
I cannot remove it from the startup
I cannot uninstall it using Avast Antivirus Clear, its just stuck!

What kind of antivirus is that and is there any solution to remove it from my system without removing the Windows?

Follow instructions: https://www.avast.com/uninstall-utility