Fix Avast Antivirus Errors 42110 and 42125 in Windows 11/10


the Avast antivirus error 42110 or 42125 is known to occur on Windows 11 or Windows 10 when PC users try to run a boot scan using Avast on their device. In this article, we are providing the most suitable solutions which the affected users can apply to fix the error.

When this problem occurs on your Windows device, you will receive the following corresponding error message with the respective accompanying code;

Error 42110 Avast Error 42110
Error 42110: Avast! The antivirus has encountered a problem and needs to close.
We are sorry for the inconvenience.

Error 42125 Avast! Virus error 42125

You are likely to encounter one of the error codes for the following reasons;

  • Decompression bomb problem (compression or zip bomb)
  • Software conflict
  • Installation problem
  • Damaged or missing Avast files
  • Avast Anti-Malware has expired
  • Unstable or poor network connection
  • File corruption in System Restore volume

Avast antivirus error 42110 and 42125

If the Avast antivirus error 42110 and 42125 occurred on your Windows 11/10 computer, you can try our recommended solutions below in no particular order to quickly fix the error on your system.

  1. Update Avast
  2. Start SFC scan
  3. Check and fix the decompression bomb problem
  4. Uninstall any other security software (if applicable)
  5. Disable and re-enable System Restore
  6. Repair/Reinstall Avast

Let’s take a look at the description of the process involved regarding each of the listed solutions

1]Update Avast

It’s probably the Avast antivirus error 42110 and 42125 that happened on your Windows 11/10 computer might be because the security software is not updated. In this case, to rule out this possibility as a potential culprit, you can update Avast.

To update Avast to the latest version/build, follow these steps:

  • Launch the Avast app.
  • In the app interface, click Action menu from the upper right corner.
  • Then select Settings on the left side.
  • Navigate to the General tongue.
  • Click on Update.
  • Then click on Check for updates inside of Update sub-tab.

Avast will now automatically download and install the latest version. Wait for some time until the process completes.

  • Restart Avast when prompted.

Now try to run the boot scan and see if the error code triggers again. If so, try the next solution.

2]Run SFC scan

Start SFC scan

System file corruption is also a likely culprit that can prevent Avast from running a malware scan. In this case, you can run the SFC scan and see if that helps. Likewise, if there is an error in the registry files related to Avast, you may experience an Avast registry file problem. In this case, you can repair the entire registry and see if that helps.

3]Check and fix the decompression bomb problem

Check and fix the decompression bomb problem

For most affected users, the most common reason for focus errors is that Avast thinks it is handling a file that, when downloaded, can cause a DoS attack. The file in question is usually referred to as a “decompression bomb” – a term for chronic documents (RAR or ZIP) with a high compression ratio. Once extracted, these documents can become very large and take up all the disk space as well as the hog’s system memory. These “decompression bombs” are repeatedly used in DoS attacks by malicious actors in an attempt to weaken and neutralize antivirus; but since the majority of security tools can detect this practice, the security software will not scan the archive in order to avoid crashing the system or making it more vulnerable to attacks.

So, if this is your case, the best way to fix the problem you are currently facing is to simply delete the file and run another startup scan in Avast on the next system startup. If you still need the file you deleted, you can try downloading it from a reliable source.

4]Uninstall any other security software (if any)

Software conflicts assuming you have other security software other than Avast installed and running on your Windows 11/10 device can result in the errors highlighted. In this case, you can remove any other third-party antivirus program from your PC using the dedicated AV Removal Tool to remove all files associated with that antivirus program.

5]Disable and re-enable System Restore

Disable and re-enable System Restore

This solution worked for some affected users who reported that the errors appear to be some kind of system file corruption related to the System Restore volume. In this case, they were able to fix the problem by disabling System Restore, then restarting the Windows 11/10 PC, and upon booting, re-enabling System Restore. Then running Boot Scan with Avast completed successfully with no issues.

6]Repair/Reinstall Avast

If nothing has worked so far to fix the problem, you can repair Avast first; and if this is not useful to you, you can simply uninstall Avast and then download the web installer or offline installer and reinstall the latest version of Avast on your system.

To repair Avast, follow these steps:

  • Launch the Avast app.
  • Click on Action menu in the upper right corner.
  • To select Settings.
  • Navigate to the General tongue.
  • Click on Repair in the list of submenu items.
  • In the right pane, scroll down to always problems section.
  • Click on the REPAIR APP button.
  • Click on Yes at the confirmation prompt and wait for the initial scan to complete.
  • Finally click on solve all on the next screen to fix any identified potential issues related to Avast.
  • Restart the computer when finished.

Alternatively, you can repair Avast through the Settings app or through the Programs and Features applet in Control Panel.

I hope this helps you!

Similar item: Fix Avast Update Assistant Error 1316, 1638, 1603

How to fix error 42125 The ZIP archive is corrupt?

To fix error 42125 Zip archive is corrupt on your Windows 11/10 PC, try the following suggestions:

  • Delete unwanted files on the system.
  • Check the hard drive for errors.
  • Update your device driver.
  • Perform a system scan.
  • Update Windows to the latest version.
  • Reinstall the Avast program.

Which folder is a decompression bomb?

A decompression bomb or zip bomb is a malicious archive file that contains a lot of repeated data that can crash the program that reads it. Also known as the “zip of death”, a zip bomb is often used to render an antivirus program useless, so that more traditional viruses can enter a system.


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