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Open the Run window, type MSConfig in the text box and click OK.Or boot your computer in safe mode and perform the uninstall. To do this, you need to use a professional uninstaller. If Avast does not update the virus definitions after trying the above method, you can reinstall Avast. In the new window, click Restore and wait for Avast to make the necessary changes to the data files to restore the client software.Click on the application and select Edit.Open the Windows Control Panel (visible by the large icons) and click on Programs and Features.If no updates are expected, you will need to restore your Avast installation files. Once the update is complete, check to see if your problem has been resolved.Under the ‘update interface’, click on the CHECK FOR UPDATES button.Start Avast and go to Menu and Settings.So, check for expected updates and install them. One of the easiest solutions is to fix the incompatibility issues that may be causing your Avast problem. The solution to the “Virus definition update failure” problem in Avast Antivirus

If your Windows is not updated regularly, the new version of Avast may not be compatible with the version of Windows already installed. Another reason why Avast virus definitions are not updated is an incompatibility issue.This can happen if the update failed or was canceled during installation. One of the main reasons for this error may be the incorrect installation of Avast.Therefore, even if the update is properly installed on your computer, the virus definition will generate an error. The reason why you cannot update Avast virus definitions is that the recent update was installed on an abnormal date.What is the reason for the “Virus definitions update failure” problem in Avast Antivirus? Why can’t I update my virus definitions?.How do I update my Avast virus definitions?.Utilize the built-in troubleshooting menu.Update your Avast to the latest version.The solution to the “Virus definition update failure” problem in Avast Antivirus.What is the reason for the “Virus definitions update failure” problem in Avast Antivirus?.