What is a2start.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 a2start.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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A2start.exe file information

The process known as Emsisoft Security Center or Security Center or a-squared Security Center belongs to software Emsisoft Anti-Malware or a-squared Anti-Malware by Emsisoft GmbH or Emsi Software GmbH ( or Emsisoft (

Description: A2start.exe is not essential for the Windows OS and causes relatively few problems. The file a2start.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 845,960 bytes (25% of all occurrences), 6,812,208 bytes, 5,193,664 bytes or 7,245,464 bytes. 
The program is not visible. The a2start.exe file is certified by a trustworthy company. It is not a Windows system file. A2start.exe is able to record keyboard and mouse inputs, monitor applications, connect to the Internet and manipulate other programs. Therefore the technical security rating is 12% dangerous; however you should also read the user reviews.

Uninstalling this variant: You can uninstall Emsisoft Anti-Malware or a-squared Anti-Malware, update it, or get help from the software vendor. Click on to update it, click on for support, or click on Emsisoft Anti-Malware or a-squared Anti-Malware in Windows Control Panel (Software or Programs category) to uninstall it.

Recommended: Identify a2start.exe related errors

Important: Some malware camouflages itself as a2start.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the a2start.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

This is A squared antivirus and spyware program. Excellent program
  houseof bat  
A squared - Virusscanner

Summary: Average user rating of a2start.exe: based on 2 votes with 2 user comments. 2 users think a2start.exe is essential for Windows or an installed application.

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Best practices for resolving a2start issues

A clean and tidy computer is the key requirement for avoiding problems with a2start. 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 a2start.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

a2start.exe [all]