AVG is not as good as it used to be, hence the reason you said its shit

You need Avast, i dont even know its installed, and its caught viruses for me in the past and saved me downloading infected files, auto updates aswell so you dont need to fanny about with it, just leave it.

One of the best free ones for sure

http://www.filehippo.com/download_avast_antivirus/