What is symevent?

Symevent.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if symevent.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for symevent drivers in need of updating

Symevent.sys file information

The process known as Symantec Event Library belongs to software SYMEVENT by Symantec (

Description: Symevent.sys is not essential for the Windows OS and causes relatively few problems. The symevent.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 123,952 bytes (35% of all occurrences), 124,464 bytes, 124,976 bytes, 126,584 bytes or 142,936 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. The file is a Verisign signed file. The symevent.sys file is digitally signed. The service has no detailed description. Symevent.sys is not a Windows system file. symevent.sys appears to be a compressed file. Therefore the technical security rating is 20% dangerous, however you should also read the user reviews.

Recommended: Identify symevent.sys related errors

If symevent.sys is located in a subfolder of "C:\Program Files", the security rating is 20% dangerous. The file size is 124,016 bytes (33% of all occurrences), 110,352 bytes or 82,136 bytes. The program has no visible window. The service has no detailed description. The symevent.sys file is not a Windows system file. Symevent.sys is a Verisign signed file. It is certified by a trustworthy company. symevent.sys appears to be a compressed file.

Important: Some malware disguises itself as symevent.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the symevent.sys 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

Part of Symantec Norton Internet Security suite
  Georg   (further information)
Belongs to Norton Internet Security
also part of PCAnywhere 10
Microsoft (R) Windows Debugger Version 6.6.0003.5
It seems to be affecting PerfectDisk from operating correctly!
  Claude   (further information)
garnichts und finde das programm nicht auf mein pc obwohl der immer anzeigt
Is causing a nightly crash on a Windows 2003 server running PCA 11.0 and Symantec Corp, AV. Per Microsoft, if this causes errors you should update it from the vendor (Symantec).
  Dave T. (MCSA, Network Admin)  
Nada, no se para que es, y como funciona
  jose angel  
Nortun Utilities 2020
  AHO -  

Rating chart

Summary: Average user rating of symevent.sys: based on 6 votes with 10 user comments. 4 users think symevent.sys is essential for Windows or an installed application. One user thinks it's probably harmless. One user suspects danger. 5 users don't grade symevent.sys ("not sure about it").

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Best practices for resolving symevent issues

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

symevent.sys [all]