What is System.dll?

System.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. The following information can help you determine if System.dll is a Windows system file or if it belongs to an application that you can trust.

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System.dll file information

The process known as System or system belongs to software Cisco Secure Desktop or Dbsqlinfo by Cisco Systems ( or Microsoft (

Description: System.dll is not essential for the Windows OS and causes relatively few problems. System.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 792,576 bytes (50% of all occurrences), 688,128 bytes, 730,624 bytes or 83,120 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program is not visible. The service has no detailed description. It can change the behavior of other programs or manipulate other programs. It is not a Windows core file. System.dll is able to monitor applications and manipulate other programs. Therefore the technical security rating is 64% dangerous; however you should also read the user reviews.

Uninstalling this variant: You could uninstall the associated program (Start > Control Panel > Uninstall a Program > Cisco Secure Desktop).

Recommended: Identify System.dll related errors

Important: Some malware camouflages itself as System.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the System.dll 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 Microsoft .NET Framework
it is a system recovery file.
The primary objects used in a .NET Framework application are stored in the System.dll
  Daniel Saunders  

Summary: Average user rating of System.dll: based on 3 votes with 3 user comments. 2 users think System.dll is essential for Windows or an installed application. One user suspects danger.

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Best practices for resolving System issues

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

System.dll [all]