The genuine sys.dll file is a software component of Bookeeper 2008 by Avanquest USA.
"sys.dll" is a dynamic link library file that can be used by many applications and/or viruses. One known application is the Bookkeeper 2008 software by Avanquest USA. The file executes the library of data needed for the software to function properly. Avanquest USA is a publishing company for small businesses and larger ones too, but also creates computer utility software, business software, and digital media software for both commercial and retail markets.
Sys stands for System
Sys.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 sys.dll is a Windows system file or if it belongs to an application that you can trust.
Description: Sys.dll is not essential for the Windows OS and causes relatively few problems. Sys.dll is located in a subfolder of "C:\Program Files".
The file size on Windows 10/8/7/XP is 36,864 bytes.
The service can be started or stopped from Services in the Control Panel or by other programs. There is no information about the author of the file. The program has no visible window. There is no detailed description of this service. Sys.dll is not a Windows core file. sys.dll appears to be a compressed file. Therefore the technical security rating is 56% dangerous.
Recommended: Identify sys.dll related errors
If sys.dll is located in a subfolder of C:\Windows\System32, the security rating is 66% dangerous. The file size is 37,888 bytes. The process can be uninstalled in the Control Panel. The sys.dll file is a file with no information about its developer. It can change the behavior of other programs or manipulate other programs. The program is not visible. There is no detailed description of this service. The sys.dll file is not a Windows core file. Sys.dll is able to record keyboard and mouse inputs.
If sys.dll is located in a subfolder of C:\Windows, the security rating is 82% dangerous. The file size is 37,888 bytes. Sys.dll is a file with no information about its developer. It can change the behavior of other programs or manipulate other programs. The program has no visible window. The service has no detailed description. Sys.dll is not a Windows system file. Sys.dll is able to record keyboard and mouse inputs.
Important: Some malware camouflages itself as sys.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder, for example W32.Koobface.B (detected by Symantec), and Trojan.Win32.Agent.cnfo (detected by Kaspersky). Therefore, you should check the sys.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.
A clean and tidy computer is the key requirement for avoiding problems with sys. 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 sys.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.