What is Hook.dll?

The genuine Hook.dll file is a software component of Asus Eee PC by ASUS.
ASUS Eee PC is a brand of lightweight netbooks developed by ASUS in 2007. Hook.dll is required for the proper functioning of ASUS Eee PC components. ASUS Epee PC was developed as a lightweight system designed to mainly handle Internet applications,. It was powered by a Linux-based operating system, shipped with a solid-state drive (SSD), and was offered at a relatively small cost. Newer models of the ASUS Epee PC provided an option for Microsoft Windows operating systems and rotating media hard disk drives (HDD). ASUS is a Chinese personal computer vendor that manufactures everything from desktops and laptops to mobile phones, monitors, optical storage devices, and graphics cards. In 2013, it was the world's fifth largest computer seller, in terms of sales. The company began launching graphics cards in 2005 with their initial PhysX accelerator card. ASUS was founded in Taipei in 1989 by T.H. Tung, Ted Hsu, Wayne Hsieh and M.T. Liao, all previously employed by Acer. The company is currently headquartered in Taipei, Taiwan.

Hook stands for Capslock and NumKey Notification Hook

Hook.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. You can fix your Hook.dll problem by downloading the correct Hook.dll file. The following information can help you determine if Hook.dll is a Windows system file or if it belongs to an application that you can trust.

Click to Run a Free Scan for Hook.dll related errors

Hook.dll file information

The process known as CapsAndNumKeyNotify or hook DLL or Direct Folders belongs to software CapsAndNumNotifyDll or ArcSoft PhotoImpression (version 5) or Window Master or Direct Folders or hook Dynamic Link Library by ASUS ( or Code Sector (

Description: Hook.dll is not essential for Windows and will often cause problems. Hook.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 208,792 bytes (80% of all occurrences), 49,152 bytes and 8 more variants. 
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 has no visible window. There is no detailed description of this service. The Hook.dll file is not a Windows core file. The Hook.dll file is able to record keyboard inputs. The file has a digital signature. The Hook.dll file is a Verisign signed file. Hook.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 75% dangerous, however you should also read the user reviews.

Uninstalling this variant: The software vendor offers the option to do the following:

Recommended: Identify Hook.dll related errors

If Hook.dll is located in the C:\Windows\System32 folder, the security rating is 91% dangerous. The file size is 28,672 bytes (50% of all occurrences) or 235,304 bytes. There is no file information. The program is not visible. The Hook.dll file is able to record keyboard inputs. There is no detailed description of this service. It is not a Windows core file. Hook.dll is able to record keyboard and mouse inputs.

If Hook.dll is located in a subfolder of C:\, the security rating is 96% dangerous. The file size is 28,672 bytes. There is no file information. The program has no visible window. There is no detailed description of this service. Hook.dll is able to record keyboard inputs. The Hook.dll file is not a Windows core file. Hook.dll is able to record keyboard and mouse inputs. Hook.dll appears to be a compressed file.

Important: Some malware camouflages itself as Hook.dll. Therefore, you should check the Hook.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

belongs to VMware application
  elena   (further information)
it might be part of netzero Hi-speed
its is related to net zero's operation
Its also used for spywhere and key loggers
this file monitors keystrokes ,relays that info to remote server at startup & subsequently tells net zero what type of garbage to download to your system.May be more dangerous since exe exe clones IE then write protects malware . note:soon after i installed net zero, my ad-awere se& spybot s&d were corrupted!!! beware there are a couple more bad guys hidden in nz software
after uninstalling netzero & then trying to reistall it, got error message saying couldn't "write" file hook.dll, click abort to stop install, retry to try to write file again or ignore to skip file....clicked ignore and now on internet, not sure if it is important or not...need more info plz
got new hard drive, win xp, downloaded net zero small version got the hook dll in the comp from there add on files that if u stop wont let u go onto net
Netzero plants the hook.dll in their package to monitor the customers!
  try run NIS and Netzero at same time  
It can be removed by Norton Antivirus
  Roberto   (further information)
I cannot claim to know that it is indeed dangerous, but I put it in quarantine and NetZero is still working. Therefore it can't be essential to the functioning of NetZero and is safe to remove.
  John Z  
steals passwords
  Webmaster   (further information)
hook.dll is commonly used to replace a certain if not all process of a targeted dll's memory on the fly. Correct me if i'm wrong. It can be dangerous (causing unwanted crash) or not (replacing memory hex for certain procedures).
it's VMware if you have VMware tool installed in a virtual machine
it's for proxyway
used for desktop enhancers (RKLauncher and more)
hook.dll is also part of Trust drivers for mice that have more than the standard 3 buttons. IT DOES keylog but in a legit way (it's required for the extra buttons on the mouse to work). If you are installing Trust drivers for a Trust mouse and has more than 3 buttons (inc Scrollwheel), this file may be flagged by your AV as a keylogger. Just allow the file.
  Dan W   (further information)
Part of Logitech's SetPoint
its also part of a mouse configuration software which is able to use programmable Macro instructions
allows attackers to access your computer from remote locations
  Benet   (further information)
It's to activate the special buttons on the "TRUST Gamer Optical Mouse GM-4200, without this file located in C:\Windows\System32\Hook.dll, you can't use the special buttons, and it will give you a message. File has been checked @ Avast 'nd AVG, Says this file that used for the mouse isn NOT a Dangerous file, and won't harm your computer.
not to be confused with hookdll.dll
Used by DirectFolders application (246Kb) and found within that app's folder
  potomac   (further information)
IOBit Advanced System Care rates Hook.dll as a Trojan, Its description is Infostealer.Bzup; risk level is critical and it resides in C:\Windows\System32\. ASC enttry during the Spyware Removal section of the program. There is just one thing that has me really concerned. I let the program (ASC) removethis item every time I scsan my computer, however, on the next scan (in as little as 5 seconds), Hook.dll is there one again. Is it because ASC cannot remove it or is it because it is immediately replaced on my computer? FInally, my computer seems to be working just fine.
  dgbvan   (further information)
It locks the software and we cannot open it even after a virus scan
  Shantanu Dhasal  
I need this file so my keylogger will function properly
its a trojan

Rating chart

Summary: Average user rating of Hook.dll: based on 29 votes with 26 user comments. 10 users think Hook.dll is essential for Windows or an installed application. One user thinks it's probably harmless. 3 users think it's neither essential nor dangerous. 3 users suspect danger. 12 users think Hook.dll is dangerous and recommend removing it. 6 users don't grade Hook.dll ("not sure about it").

Do you have additional information?
What do you know about Hook.dll:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving Hook issues

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

Hook.dll [all]