I don't think it's some cpu issue because I used arch for sometime on my another laptop which is poorer in terms of hardware and cpu than current one. But again I might be wrong, will try to understand if this happens again.
I didn't know if we have to scan files manually in it.
I just want to make my system more protected, because it's said that linux is more prone to attacks than windows. So maybe I just need a software which can monitor if everything is going good. and I am a newbie in linux, so sorry if that question sounded vague.
For real