Okay, I just resolved the issue
Here is how i did it..
First i got a article on google that explains how to uninstall avast with the help of Avast uninstaller. I followed all these steps and download avast offline installer from the same site installed it again. and then i used avast removal tool to remove avast competently and installed Esset antivirus now.
Hellow everyone,, I am trying to Install esset antivirus on my computer, But not able to do it.. each time i try to install esset, It says that other antivirus product is already running.