The Avast antivirus software secures your data from hackers and removes any malware that affects your computer. This antivirus keeps your computer secure and private. The latest version of Avast has Webcam Security Protection and Wi-Fi Security Alerts.
This page helps you to fix Avast antivirus error code 42109 in simple steps.
Repair the error code using the Avast Setup wizard:
Step 1: If you see the error 42019 on your Windows computer, try to fix this error using Avast Setup wizard.
Step 2: Make sure that all applications are closed.
Step 3: Right-click on the Start icon and click Settings.
Step 4: Under Settings, click Apps.
Step 5: Now click Apps & features in the left pane of the screen.
Step 6: Locate and click Avast antivirus on that screen, then click Uninstall.
Step 7: If the User Account Control dialog box opens, click Yes.
Step 8: Now the Avast Setup wizard opens. Here, click Repair.
Step 9: Click Yes to continue the repair process.
Step 10: Wait for few minutes until the setup wizard repairs Avast antivirus on the computer.
Step 11: The setup wizard will check for issues in the Avast package.
Step 12: If there are any corrupted files, they will be restored.
Step 13: If prompted, click Restart computer.
Reinstall Avast antivirus:
Step 1: If you see the same error after running the Avast Setup wizard, uninstall the Avast antivirus on the computer.
Step 2: Open the Windows computer and click the Start icon.
Step 3: Type control panel and click Control Panel in the best search list.
Step 4: On the top right corner, click the View by drop-down and click Category.
Step 5: Now click Programs > Uninstall a program.
Step 6: In the next window, locate and select Avast antivirus.
Step 7: Click the Uninstall/Change button.
Step 8: If prompted for permission by the User Account Control dialog box, click Yes.
Step 9: Now the Avast Setup wizard appears, in which you have to click Uninstall.
Step 10: Once the antivirus is uninstalled, download the latest version of the Avast antivirus from the official Avast website.
Step 11: Once the download is complete, check the digital signature in the setup file.
Step 12: Right-click the downloaded setup file and click Properties.
Step 13: In the Properties screen, select Digital Signatures.
Step 14: In the Digital Signature screen, under the Signature list, select Avast software and click OK, then click Details.
Step 15: Now click General and check if the Digital Signature is OK.
Step 16:Now run the setup files and follow the on-screen instructions to complete the Avast antivirus installation on the Windows computer.
Finally, the Avast runtime error code 42109 is fixed successfully.