What is atnt40k?

Atnt40k.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 atnt40k.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for atnt40k drivers in need of updating

Atnt40k.sys file information

The process belongs to software Meeting Manager for Internet Explorer or Sales Center for Internet Explorer or ActiveTouch NT Appsharing Driver or Event Manager for Netscape Navigator and Mozilla by WebEx Communication (

Description: Atnt40k.sys is not essential for the Windows OS and causes relatively few problems. Atnt40k.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 51,392 bytes (66% of all occurrences), 50,272 bytes or 51,304 bytes. 
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 atnt40k.sys file is not a Windows system file. The process can be removed using the Control Panel's Add\Remove programs applet. atnt40k.sys appears to be a compressed file. Therefore the technical security rating is 44% dangerous.

Uninstalling this variant: In case of problems with atnt40k.sys, you can uninstall the program using the Control Panel ⇒ Uninstall a ProgramMeeting Manager for Internet or Sales Center for Internet.

Recommended: Identify atnt40k.sys related errors

Important: Some malware disguises itself as atnt40k.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the atnt40k.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.


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Best practices for resolving atnt40k issues

A clean and tidy computer is the key requirement for avoiding problems with atnt40k. 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 atnt40k.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

atnt40k.sys [all]