newdot.net is spy-/adware not a virus. I’m not sure if Avast detects this one but I am sure Vlk will tell you :wink:

It is always a good thing if you do not only use av software, but also applications like Ad-Aware and Spybot S&D and ofcourse have a firewall. (best is a router with hardware firewall)

Since there is no application that detects all harmfull things, I advise to use the two mentioned applications along with Avast and also HijackThis.