For anti virus software to provide effective protection, it is essential that the virus definition database used is comprehensive and frequently updated.
Virus authors are constantly creating new variants and new viruses in attempt to exploit vulnerabilities in user’s systems.
While it might be fine for most users, letting your antivirus package update itself every few minutes isn’t great if you have a very small limit on your internet connection or it’s not very fast and constant updates are eating up your bandwidth, such as when using a mobile dongle on your laptop for example.
It’s also true that if you disable the updates or have computers that are constantly offline and not connected to the internet for long periods or at all, the virus definitions will get badly outdated in no time and your computer becomes more vulnerable.
Based on them program is blocking opening of dangerous files or URLs.
The virus signature database is updated several times a day in order to ensure you have all of the latest known virus definitions so that you can protect your managed devices from these rapidly evolving threats.
You can download virus definition file updates from the console, either immediately as a one-time task or as a regularly scheduled task.
Virus definitions are the primary method of detection for most anti virus software programs.
During a virus scan, anti virus software compares the content on a computer (including the hard disk, boot sectors, RAM, and removable drives) against its virus defintion database.
Therefore it is important to keep the virus definitions up-to-date.
Follow the steps below to learn how to do it manually on the offline machine.
Sometimes Avast may also block safe programs or websites because of the out-dated virus definitions. Major updates to Avast virus definitions are usually released daily, while the smaller ones are delivered constantly throughout the day via the streaming updates.
By default all Avast antivirus solutions (Free Antivirus, Pro Antivirus, Internet Security and Premier) are downloading the virus definitions updates automatically when your computer has access to the Internet.
So it is extremely important to keep it updated to the latest version.
Otherwise your computer can potentially get infected and antivirus won’t help you.