Well, that is a good question, but indeed not easy to answer. The issue here is that it is generally quite hard to detect or remove Malware if you haven't finished any UNITE training program.
How can people just tell by looking at the file that its a virus, malware, etc?
There are different operations you can do with a file to determine if it is Malware or not. If you have a file, let's call it example.exe, you can not see if it is Malware when you just physically look at it. To determine whether a file is Malware or not just upload it to virustotal.com.
For trained people here it is easier to determine if a file is bad or not as they are well trained people. Let's say your file has following location: C:\Users\Machiavelli\4ijhi22\example.exe we try to research the file and the directory on the internet. But for "normal" people which don't have qualification in this area, it is quite hard to do this.
These research qualitites you will learn in a so-called Malware Removal School.
You can join the Malware removal program if you like to: https://www.bleepingcomputer.com/forums/t/532535/malware-removal-training-program/
Also how can you manually clean out your computer? Thanks
These qualities you will learn at UNITE schools. It would be too much to describe it here - it is like explaining what Windows is - you start explaining but can not stop as it is sooo much. :-)
If you have further questions, feel free to ask me.
Edited by Machiavelli, 21 March 2017 - 07:53 PM.