This just happened this evening… it keeps opening a program called Secureline VPN, which I don’t know where it came from… I"m using the free version of Avast and always have … (Except when I tried purchasing the Premium and had to get rid of it) I tried disabling the Secureline, which says my internet is off, but the only way I can get it back on is disabling Avast all together. I don’t want the firewall or Secure Line or any of that, just anti virus. How can I get my free Avast back? I’m using Windows 7 Pro.
Clean Install of Avast:
https://goo.gl/4Ptzkf
This time, choose a custom install and uncheck the items you don’t use or don’t want installed. 
This video should help you if it’s needed:
https://www.youtube.com/watch?v=x5Lnn4OclPg