What is AM_Delta.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 AM_Delta.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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AM_Delta.exe file information

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

The process known as AntiMalware Definition Update belongs to software Microsoft Anti-Malware Signature Package or Microsoft Malware Protection by Microsoft (

Description: AM_Delta.exe is not essential for Windows and will often cause problems. The AM_Delta.exe file is located in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 710,416 bytes (20% of all occurrences), 3,063,360 bytes, 912,120 bytes, 11,043,056 bytes or 4,387,096 bytes. 
The program has no visible window. It is certified by a trustworthy company. The file is not a Windows system file. Therefore the technical security rating is 32% dangerous, however you should also read the user reviews.

Uninstalling this variant: If there are any problems with AM_Delta.exe, you may also want to use the software publisher's support or uninstall the program using the Control Panel ⇒ Uninstall a ProgramMicrosoft Anti-Malware Signature Package.

Recommended: Identify AM_Delta.exe related errors

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

its always slowing my computer down, i cant find it in my files and im unable to shut it down in task manager.
It uses around 44 k of memory usage most of the time, and I comes with mpsigstub exe as a readable update for your computers virus definitions when it updates Microsoft security essentials.
  Alex   (further information)

Summary: Average user rating of AM_Delta.exe: based on 2 votes with 2 user comments. One user thinks AM_Delta.exe is essential for Windows or an installed application. One user suspects danger.

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Best practices for resolving AM_Delta issues

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

AM_Delta.exe [all]