I want an antivirus which is free and powerful and doesn't use more RAM because my computer has only 2gb ram.

https://www.bitdefender.com/solutions/free.html
Bitdefender FREE


Lightning-fast free antivirus

Bitdefender Antivirus Free Edition is blazing fast, free to use, and loaded only with the bare-bones protection features that every computer needs.

Installs in seconds, runs at max speed without slowing down your PC
Good for gaming, image and video editing, and resource-intensive applications
Powerful protection packed into a light solution


 


I posted the link where he can find the info.
And it's FREE Software.
 


I have read and tested it and it appears as they do have different signatures. But that was half a year ago. It may have changed without my knowledge.

 

I recommend MalwareBytes + Windows Defender

1. https://www.malwarebytes.com/

2. Comes with your PC

Just make sure to disable start with windows For MB :)
 
MERGED QUESTION
Question from sohamj789 : "Is Avast Premier is a good antivirus for my PC? Will it protect me from Ramsomware?"

I just downloaded Avast Premier, and I want to ask that will it protect me from Trojons, Malwares and Ramsomwares like WannaCry? If not I will switch to another antivirus. Please Reply me any good antivirus for my PC (paid antivirus). :/ :/ :/