Avast Antivirus, one of the most effective antivirus systems, protects your computer from online threats such as malware, spyware, and viruses. The antivirus software is simple to install and maintain the smooth operation of your computer systems. It maintains a close eye on any hazardous elements that could degrade your computer's overall performance. While there are numerous other advantages to having Avast Antivirus installed on your computer systems, there are times when Avast will not update for a variety of reasons. However, if you can figure out why this happens, you'll be able to solve the problem in no time.