What is Service_21.exe?

The genuine Service_21.exe file is a software component of Service_KMS by ELDI.
KMSpico is an activator tool that is used to illegally activate copies of Windows 7/8/8.1/10 and Office 2010/2013/2016. Service_21.exe launches the KMSpico program. This is not a critical Windows component and can be removed if known to cause problems. KMSpico uses the Microsoft KMS (Key Management Service), a service that activates programs through the local network, without having to contact Microsoft. KMSpico replaces the installed key with a volume license key, creates an emulated instance of a KMS server on the user's system and forces the target programs to activate through the emulated KMS server. The program is available for free from numerous websites. The creator of KMSpico operates under the alias of ELDI.

Service_21 stands for Service_ for KMSpico (version 2.1)

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 Service_21.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.

Click to Run a Free Scan for Service_21.exe related errors

Service_21.exe file information

The process known as Service_KMS or Service_21 belongs to software Service_KMS or KMS 360.1 (version 32Bit, 64Bit) by @ByELDI or Il Webmaster (version 21).

Description: Service_21.exe is not essential for the Windows OS and causes relatively few problems. Service_21.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 985,280 bytes (75% of all occurrences) or 965,776 bytes. 
The process can be removed using the Control Panel's Add\Remove programs applet. The program has no visible window. The file is not a Windows system file. Service_21.exe is able to monitor applications and manipulate other programs. Therefore the technical security rating is 66% dangerous.

Uninstalling this variant: You can uninstall KMS 360.1 32Bit or KMS 360.1 64Bit, or try to get help from the software vendor. Click on KMS 360.1 32Bit or KMS 360.1 64Bit in the Windows Control Panel (Software or Programs section) to uninstall it, or click on to visit the vendor's website.

Recommended: Identify Service_21.exe related errors

Important: Some malware also uses the file name Service_21.exe, for example HackTool:Win32/AutoKMS (detected by Microsoft), and TROJ_GEN.R0C1C0EGU16 or HKTL_AUTOKMS (detected by TrendMicro). Therefore, you should check the Service_21.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.


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Best practices for resolving Service_21 issues

A clean and tidy computer is the key requirement for avoiding problems with Service_21. 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 Service_21.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

Service_21.exe [all]