How to Fix Avast Error 42125 on Windows 10

Last Updated on October 13, 2020



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The Avast 42125 error is one of the most common antivirus errors that Avast users encounter. Every PC and laptop user is well aware that the virus is a serious threat to their computer or other systems they use. The same is true for malware. Avast Antivirus is the most important and effective software you can use to protect your systems. However, if your antivirus system breaks down, your trust factor can suffer. There is no doubt that Avast Error 42125 is involved in this discussion.

If you are too concerned about problems with Avast Antivirus or you get exactly this error when using Avast Antivirus, this article is for you. Here are some troubleshooting methods that you can use to solve any problem you may have.

Reasons for Avast Error 42125

In most cases, ZIP files are downloaded from the Internet. The ZIP file format provides a convenient way to download large amounts of files by archiving them in less time, which saves space on the system hard drive. As explained in the above scenario, ZIP files are more vulnerable to corruption due to incorrect downloads. Let’s discuss other causes of ZIP file corruption as described below:

  • The most common cause is a CRC error.
  • Using non-original applications to extract files from the zip archive
  • Bad sectors on the hard disk where the ZIP archive is stored
  • Damage to the file system storing ZIP files
  • Fails to complete system operation correctly when transferring ZIP archives

Decompression Bomb Warnings

The most common reason this error message appears is because Avast actually refers to the file it analyzes as a “decompression bomb” (also known as a zip bomb).

The “decompression bomb” is a term for very high compression archive files (RAR or ZIP). These files can become very large after extraction and potentially use all memory.



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These “decompression bombs” are regularly used in DoS attacks to disable antivirus software. Most security tools are familiar with this approach and therefore refuse to scan the archive to avoid system crash or make it more vulnerable to attacks.

If this scenario is applicable and you have reason to believe it may be a decompression bomb, the best way to solve the problem is just to delete the file.

If you got it from a dubious place, just remove it from your system and run another scan of the Avast boot time on the next boot.

If your investigation didn’t show that the file that caused the problem with Avast was actually a decompression bomb, go to the next possible fix.

Remove the drivers

You can try to uninstall the card or video card drivers from Device Manager and reinstall the latest drivers from the manufacturer’s website.

а. Click on the Start button.
b. In the search box, type devmgmt.msc and press Enter.
c. Select a video card device and right-click it.
d. Now select Properties.
е. In the “Properties” window on the “Driver” tab, click “Delete”.

f. If you are sure that you want to uninstall the driver, click OK.

Note. If you want the driver to be completely uninstalled from your computer, select “Uninstall driver software from this device”.



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