What is AvastUI.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the AvastUI.exe 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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AvastUI.exe file information

Windows Task Manager with AvastUI
AvastUI.exe process in Windows Task Manager

The process known as avast! Antivirus belongs to software Avast Free Antivirus or Avast Internet Security or Avast Pro Antivirus or Avast Antivirus or Avast! Antivirus or avast! Premier or AVAST Software a.s by AVAST Software ( or Avast Software s.r.o or ALWIL Software (

Description: AvastUI.exe is not essential for the Windows OS and causes relatively few problems. AvastUI.exe is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 5,227,112 bytes (11% of all occurrences), 5,515,496 bytes and 60 more variants. 
The AvastUI.exe file is certified by a trustworthy company. The AvastUI.exe file is not a Windows system file. The process is loaded during the Windows boot process (see Registry key: MACHINE\Run, Run). It can change the behavior of other programs or manipulate other programs. The program is not visible. AvastUI.exe is able to monitor applications and record keyboard and mouse inputs. Therefore the technical security rating is 46% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you encounter difficulties with AvastUI.exe, you may also ask the software vendor,, for advice or safely remove the program using the uninstall program of Avast Free Antivirus or avast! Free Antivirus (Control Panel ⇒ Uninstall a Program).

Recommended: Identify AvastUI.exe related errors

Important: Some malware camouflages itself as AvastUI.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the AvastUI.exe 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

Known AntiVirus Program
  Max   (further information)
avast! Antivirus
  avast user  
Avast User Interface!
avast antivirus
  avast user   (further information)
It slows down my computer; it is good for detecting and removing all kinds of viruses, etc. Just that it should not stay to continuously monitor things because it slows down the computer a lot.
Avast is the only antivirus I truly trust...
  Anonymous   (further information)
Very good antivirus....
Good antivirus program, blocks dangerous urls, disables malicious programs, and has plenty of extra goodies like a sandbox and individual file scanner
It's an Antivirus Programe.
  Mehul Garg  
Very useful antivirus program.
I have always been happy with Avast, their pre-boot scan has solved all but one problem I've had.
  Ray F. Potter   (further information)
i have installed avast for quite some time.. but i experience having my USB infected with virus twice.. when i decided to uninstall avast it leaves sttuborn files like AvastUI that wont be removed coz of the permissions.. i dont recomend it for my own experience.. sorry..
For secure my computer unit. Anti virus
avast premier internet security and anti-virus
  MR. T  

Rating chart

Summary: Average user rating of AvastUI.exe: based on 34 votes with 17 user comments. 25 users think AvastUI.exe is essential for Windows or an installed application. 5 users think it's probably harmless. 2 users think it's neither essential nor dangerous. 2 users think AvastUI.exe is dangerous and recommend removing it.

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Best practices for resolving AvastUI issues

A clean and tidy computer is the key requirement for avoiding problems with AvastUI. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the AvastUI.exe process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

AvastUI.exe [all]