What is ckldrv?

Ckldrv.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 ckldrv.sys is a Windows system file or if it belongs to an application that you can trust.

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

Ckldrv.sys file information

The process known as NetworkX belongs to software NetworkX by CrypKey (Canada) (

Description: Ckldrv.sys is not essential for Windows and will often cause problems. Ckldrv.sys is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 19,584 bytes (25% of all occurrences), 31,846 bytes and 11 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. There is no description of the program. The program has no visible window. The service has no detailed description. The ckldrv.sys file is not a Windows system file. ckldrv.sys appears to be a compressed file. Therefore the technical security rating is 52% dangerous, however you should also read the user reviews.

Recommended: Identify ckldrv.sys related errors

Important: Some malware camouflages itself as ckldrv.sys. Therefore, you should check the ckldrv.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

CrypKey Software License Manager
  Robin Keir   (further information)
this is part of the cryp key licensing package
  Rick   (further information)
I think others are right, it's not a virus
Resource hog, debris left on after shareare removal
  Watcher   (further information)
ImagePath for NetworkX in my Windows registry
ckldrv.sys is a licencing file for Honeywell Win-Pak and NStar access control systems. It is vital for the continuing function of this software
In my case, it's used by Trojan.Gen.2 virus
  Aloysius   (further information)
Necessary for Fujitsu COBOL compiler

Rating chart

Summary: Average user rating of ckldrv.sys: based on 13 votes with 8 user comments. 6 users think ckldrv.sys is essential for Windows or an installed application. One user thinks it's probably harmless. 3 users think it's neither essential nor dangerous. One user suspects danger. 2 users think ckldrv.sys is dangerous and recommend removing it.

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Best practices for resolving ckldrv issues

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

ckldrv.sys [all]