What is avast.setup?

Please read below to decide for yourself whether the avast.setup on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Avast.setup file information

The process known as avast! antivirus Update or Avast Antivirus Installer belongs to software avast! Antivirus or Avast Free Antivirus by ALWIL Software ( or AVAST Software (

Description: Avast.setup is not essential for the Windows OS and causes relatively few problems. Avast.setup is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 2,527,280 bytes (19% of all occurrences), 2,514,992 bytes and 14 more variants. 
Avast.setup is not a Windows core file. The program is not visible. There is no file information. The application uses ports to connect to or from a LAN or the Internet. Avast.setup is able to monitor applications. Therefore the technical security rating is 64% dangerous, however you should also read the user reviews.

Uninstalling this variant: If problems with avast! Antivirus or avast! Free Antivirus come up, you can contact to assist you, update to a possibly corrected version or uninstall it from your computer using the Control Panel applet Uninstall a Program.

Recommended: Identify avast.setup related errors

Important: Some malware camouflages itself as avast.setup, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the avast.setup process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

best threat solver
This file is part of Avast antivirus sw. It is used to update virusdefinitions and Avast program files.
Automatic Program Update for Avast Antivirus
it disinstalled not working at all
  Betty Gregory  
avast set up 4.8
very good anti virus
  akram kasibante  
to kill virus
Checking out Startup files
it seems like the file takes way more control than necessary to protect avast from being uninstalled manually by the user. It is a breach of windows software operation procedures and will even prevent you from turning off its service or ending its processes from windows startup using msconfig.
Program kept running even when avast wasn't, computer running at 100% capacity. Uninstalled Avast and computer has sped up significantly. Windows XP 32-bit.
Mine was turned off from outside souce and I can't turn back on, uninstall or reinstall
avast software setup

Rating chart

Summary: Average user rating of avast.setup: based on 20 votes with 12 user comments. 13 users think avast.setup is essential for Windows or an installed application. 2 users think it's probably harmless. One user thinks it's neither essential nor dangerous. 3 users suspect danger. One user thinks avast.setup is dangerous and recommends removing it. 2 users don't grade avast.setup ("not sure about it").

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Best practices for resolving avast issues

A clean and tidy computer is the key requirement for avoiding problems with avast. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the avast.setup process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

avast.setup [all]