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Avast Virus Definitions Update Failed: Expert’s Guide

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The error message “Avast virus definitions update failed” is not a primary error. Basically, this error message appears when you try to update the Avast antivirus on your device.

When this error occurs, the most frustrating thing that happens is that the Avast antivirus is not able to recognize the Windows system files and it tries to delete the files from your device.

There is a wide range of users who use Avast antivirus for quality protection for their Windows computers. Most of the users complained about this unknown error and do not have any idea how to get rid of this situation.

Here we will discuss what is the exact procedures in order to resolve the problem on your own. But before that, you should what are the major causes behind this error message. Hence, take a look at the following section and apply the steps mentioned in the section below to eliminate the error message.

What Causes the Avast Virus Definitions Update Failed Issue?

The error message usually appears on the system screen when you have changed the DNS settings. It is possible that the DNS address which is required is not good. To get rid of this situation, we suggest using the DNS of Google.

Low internet connection is also responsible for this annoying situation. Moreover, firewall blocking the updater can often interrupt the internet connection.

After knowing the exact reason behind this error message, now, let’s go ahead and check out the solutions mentioned in the section below.

Effective Procedures to Resolve Avast Virus Definition Update failed Issue:

To solve the topic under discussion, you need to go through how to fix the Avast virus definitions update failed issue.

Here are a few solutions that might fix the problem. Take a look at the troubleshooting methods and check which one is suitable for you.

Fix 1: Change the DNS Settings

One of the most important features of internet connection settings is DNS settings. With the help of the DNS settings, you can change the DNS settings.

You can get the DNS address automatically by default. But if you change the DNS settings manually, you may notice this error message.

To get rid of this situation, it is advisable to use the Google DNS address. You get the Google DNS settings easily and without any cost. Hence, change the DNS settings to Google DNS settings.

Therefore, follow the steps mentioned in the section below to change the DNS address.

Step 1

First of all, open the Run dialog box with the help of the Windows and R key. Now, type the ‘ncpa.cpl’ in the Run window and press the Enter button.

Step 2

It will lead you to open the Internet Connection settings under the Control Panel section. Now, click on the View by settings which is available at the top right corner of the system screen.

Step 3

After that, move to the Network and Internet section and select the Network and Sharing Center. Now, you will find the Change Adapter setting from the left menu and click on it.

Step 4

Thereafter, double-click on the active Network Adapter. Further, if you have admin permission, then click on the Properties option.

Step 5

Search for the Internet Protocol Version 4(TCP/IPv4) and tap on it. After that, click on the Properties option. Now, tap on the General section. After that, switch to the Radio button under the Properties section to the ‘Use the following DNS server addresses’ if it was not set properly.

Step 6

Now, you should set the DNS server to and the alternate DNS server is to use the DNS address of Google.

Step 7

Finally, click on the ‘Validate settings upon exit’ option and check the box corresponding to it. Now, click the OK button to apply the changes.

When the process gets completed, check you are getting the same error message or not.

Fix 2: Reset the Internet Explorer Settings

If you install the Avast antivirus on your mobile device or trying to update Avast antivirus from the Internet Explorer, then you need to reset the Internet Explorer settings.

Due to this, you can fix the Avast mobile virus definitions update failed issue that appears on the mobile screen. To change the settings of the Internet Explorer, follow the steps mentioned in the section below.

Step 1

First of all, launch the Internet Explorer on your device and click on the Gear icon which is situated at the top right corner of the system screen.

Step 2

Now, click on the Internet option from the menu that appears on the system screen. After that, click on the three dots present on the top right corner and select the Advanced option.

Step 3

Thereafter, click on the Reset button to reset the Internet Explorer. When the process gets completed, check whether the problem still persists or not.

Fix 3: Add a Firewall Exception for the Updater

If you are using a third-party firewall, you should go through the steps in order to add a program through it. So, walk through the steps mentioned in the section below.

Step 1

First of all, press the Start button and then move to the Control Panel section. After that, change the view of the icon from large to small and then move to the Windows Defender Firewall option.

Step 2

Thereafter, click on the Windows Defender Firewall and then select the Allow the app through the Windows Firewall option from the left side of the system screen.

Step 3

Now, move the folder where you installed the Avast application. After that, click on the Setup section and then press on the instup.exe. Next, select the executable file from that section.

Step 4

Finally, press the power button and click on the Reboot option. After changing the Internet Explorer settings, check whether the problem gets resolved or not.

Fix 4: Perform a Clean Install of Avast Antivirus

You can solve all the problems related to the Avast antivirus simply by installing a new version of Avast antivirus. Hence, uninstall the antivirus from the Control Panel section and install the latest version from the official website.

Follow the steps mentioned in the section below.

Step 1

First of all, press the Start button and move to the Control Panel section. After that, navigate to the Programs and Features section.

Step 2

Here, you will find that all the applications are installed on your device. Locate the Avast antivirus from the list and right-click on it.

Step 3

A drop-down menu will appear on the system screen. Select the Uninstall option from the list. It will take some time to complete the uninstallation process.

Step 4

Now, launch a web browser and visit the official website of Avast. Now, download the latest version of Avast antivirus which is compatible with your device.

Step 5

Wait until the downloading process gets completed and install it on your device. In this way, you can also eliminate the Avast Android virus definition update failed issue.

End Notes

Any of these troubleshooting methods will surely get the Avast virus definitions update failed issue fixed. If still face the same issue, inform us by commenting in the section below. Moreover, if you are not tech-savvy or want to save your time, then it’s better to consult an expert to get rid of the issue in no time.

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