What is a2guard.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 a2guard.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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A2guard.exe file information

Windows Task Manager with a2guard
A2guard.exe process in Windows Task Manager

The process known as Emsisoft Real-Time Protection or Background Guard belongs to software Emsisoft Anti-Malware or a-squared Anti-Malware or Emsisoft Internet Security by Emsisoft GmbH or Emsisoft ( or Emsi Software GmbH (

Description: A2guard.exe is not essential for the Windows OS and causes relatively few problems. The a2guard.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 4,997,872 bytes (16% of all occurrences), 4,873,248 bytes and 16 more variants. 
The file is not a Windows system file. The file has a digital signature. The software starts upon Windows startup (see Registry key: MACHINE\Run). The program is not visible. A2guard.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 32% dangerous, however you should also read the user reviews.

Uninstalling this variant: It is possible to completely remove Emsisoft Anti-Malware or a-squared Anti-Malware (Control Panel ⇒ Uninstall a Program), use the software publisher’s support or look for a new, improved version.

Recommended: Identify a2guard.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as a2guard.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the a2guard.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

"A Squared" Trojan, Virus detector
  Sean Olver  
well just got your scanner and it got a danger rate off 45, sp wanted to look it up. at least I tought, but non seems yo know.( now I do worry
resident shield of well-known austrian antivirus
  meetoo   (further information)
diese exe datei stammt von emisoftware. wegen ihrer guten bewertungen habe ich diese Software gekauft und bin sehr damit zufrieden. Kann ich nur weiterempfehlen für den Schutz Ihrer Dateien. Also, bitte keine Panik!!
  fritz aus D   (further information)

Summary: Average user rating of a2guard.exe: based on 2 votes with 4 user comments. One user thinks a2guard.exe is essential for Windows or an installed application. One user thinks it's probably harmless. 2 users don't grade a2guard.exe ("not sure about it").

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Best practices for resolving a2guard issues

A clean and tidy computer is the key requirement for avoiding problems with a2guard. 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 a2guard.exe 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

a2guard.exe [all]