What is keyhook.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 keyhook.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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Keyhook.exe file information

Windows Task Manager with keyhook
Keyhook.exe process in Windows Task Manager

The process known as SiS Compatible Super VGA Keyboard Daemon belongs to software SiS Compatible Super VGA Keyboard Daemon or Launch Manager by Silicon Integrated Systems (

Description: Keyhook.exe is not essential for Windows and will often cause problems. The file keyhook.exe is located in the C:\Windows\System32 folder (common is C:\WINDOWS\system32\ or C:\Program Files\ACER\Launch Manager\). Known file sizes on Windows 10/8/7/XP are 249,856 bytes (51% of all occurrences), 32,768 bytes and 6 more variants. 
The keyhook.exe file is not a Windows core file. The software is loaded during the Windows boot process (see Registry key: MACHINE\Run). The program is not visible. The keyhook.exe file is located in the Windows folder, but it is not a Windows core file. Keyhook.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 65% dangerous; however you should also read the user reviews.

Recommended: Identify keyhook.exe related errors

If keyhook.exe is located in a subfolder of "C:\Program Files", the security rating is 100% dangerous. The file size is 20,480 bytes. The program has no file description. The application starts upon Windows startup (see Registry key: MACHINE\Run). It is not a Windows system file. The program is not visible. The file is able to record keyboard inputs.

Uninstalling this variant: In case of any problems with keyhook.exe, you can also do the following:

External information from Paul Collins:

Important: Some malware camouflages itself as keyhook.exe, for example TROJ_KRAP.SMPE (detected by TrendMicro), and W32.Unruy.A (detected by Symantec). Therefore, you should check the keyhook.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

part of the Super VGA Keyboard Daemon software from Silicon Integrated Systems (SiS)
  Ima Spy  
everyone keeps saying acer, logitec, I have none of those on this computer, aopen keyboard, Microcrap mouse, generic MB, only thing is sis video card drivers, that shouldn't have anything to do with my keyboard
a part of the Super VGA Keyboard Daemon software from Silicon Integrated Systems (SiS), an OEM chip maker
Either a keylogger, or a hotkey program
SiS driver Fresh installes system without internet connection
Its harmless, the problem is its name is similar to something harmful (a keylogger). It comes from an older era thus the name is associated with modern spyware etc, thats the nature of that type of programming, they try to hide it as something you should have. SiS video drivers, Acer launch and keyboard hotkeys use the file name. I have all three of those, and have the error message at startup after trying to update the video driver direct from SiS website. "The file Keyhook.dll is not in the SysAp something or other".
    (further information)
It is a normal process but it can be reconfigured as a key logger. If it appears to be running for no reason, remove it.
It's for Logitech Keyboards, it is safe. Disable it if you think it is causing you problems. or just disable it to test if your special keys on the keyboard work or not with it disabled.
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of keyhook.exe: based on 89 votes with 9 reviews. 47 users think keyhook.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 21 users think it's neither essential nor dangerous. 4 users suspect danger. 14 users think keyhook.exe is dangerous and recommend removing it. 10 users don't grade keyhook.exe ("not sure about it").

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Best practices for resolving keyhook issues

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

keyhook.exe [all]