Avast has been a BS company since 2014 when they started to follow in AVG's Footsteps and remove Free features and make them paid only features, their flagging system is also flawed, back then it used to tell me the Blockland Launcher was a virus and it blocked it from connecting and later put it in the virus chest.
Your better of using Bitdefender Free or a paid version of Bitdefender, I wouldn't trust AVG, Avast, Avira, or even worse Norton for their corporate BS actions of gutting their free versions.
What is worse is they now Nag the stuff out of you to buy a premium version and some are doing "limited scans a day" where it will only scan your computer 3 times a day unless you buy premium.
But like I said Norton is the worst in this because something they do is somehow manage to use 100% disk usage and that can speed up an SSD's Read and writes and cause a 24/7 noisy HDD.
I stick with Windows Defender, Malwarebytes Anti-malware, and a open source multi-removal tool called Roquekiller, I don't use Super anti Spyware anymore because they decided to go the BS way in the start of 2015.
