Avast! is not a good AV solution, neither for real-time protection or actual removal. According to the
VB100; Avast! has a success rate around 77.2%, and failed to earn the VB100 cert this year for wildlist misses.
Compare that to AVG, Bitdefender or Avira which have 91.3%, 93.8% and 94.6% success rates respectively, and you can see just how silly it is to use the overweight piece of shit that Avast! has become over the years.
Bitdefender is my personal recommendation for most users, being unobtrusive and requiring little to no configuration.
If you want good real-time protection, consider the alternatives; if you only want virus removal, Malware Bytes is the way to go.