What is Null?

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

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

Null.sys file information

The process known as NULL Driver belongs to software Microsoft Windows Operating System by Microsoft (

Description: The original Null.sys is an important part of Windows and rarely causes problems. Null.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 2,944 bytes (80% of all occurrences) or 4,608 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The file is a Windows system file. The program is not visible. The service has no detailed description. The file is a Microsoft signed file. Null.sys appears to be a compressed file. Therefore the technical security rating is 0% dangerous, however you should also read the user reviews.

Recommended: Identify Null.sys related errors

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

for windows 2000 it is in Dir C:\WINNT\system32\drivers and is 2800 bytes in size
  Dave Woods  
Meldung Null wird nicht gefunden in zusammenhang nach Befall mit Trojaner Viren W├╝rmer - BraveSentry - Anti-Virus-Pro - ctfmona - winservcs32.dll - taskmon.sys - ldr5.tmp - ldr9.tmp usw. (TR/*.Gen) u.a.
Used in programming to represent the absence of a value. Windows embedded does not include this but if you want to compile a Visual Studio project, it is essential and some Visual Studio compiled projects will not build without it.
  Joseph   (further information)
Is a generic driver for windows, used with devices without a driver
    (further information)
null.sys is needed for a server, and blocks access to directories named nul. They cannot be created.
it allows the process dump (delete) file: NUL to run withoutthis the word NUL is aloud and it conciders CON (console) as a /dev/nul/empty.txt file on unix-like or as a null console con folder.
fond it can not update or remove it every time i move my mouse it stops my work and beeps

Rating chart

Summary: Average user rating of Null.sys: based on 8 votes with 7 user comments. 4 users think Null.sys is essential for Windows or an installed application. 2 users think it's probably harmless. One user thinks it's neither essential nor dangerous. One user thinks Null.sys is dangerous and recommends removing it. 3 users don't grade Null.sys ("not sure about it").

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Best practices for resolving Null issues

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

Null.sys [all]