What is npdriver?

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

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

Npdriver.sys file information

The process known as Norton Protection Driver belongs to software Norton Utilities or Norton UnErase Protection Driver or Norton Unerase Protection Driver by Symantec (

Description: Npdriver.sys is not essential for Windows and will often cause problems. Npdriver.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 81,748 bytes (42% of all occurrences), 81,780 bytes, 34,578 bytes, 34,354 bytes or 258,476 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. The npdriver.sys file is not a Windows core file. Therefore the technical security rating is 31% dangerous, however you should also read the user reviews.

Uninstalling this variant: In case you experience problems using npdriver.sys, you could uninstall Norton Utilities from your computer using the Control Panel applet Uninstall a Program.

Recommended: Identify npdriver.sys related errors

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

Belongs to Norton Systemworks
causing blue screen error
I get the blue screen and 'npdriver.sys' is written at the bottom of the page?
  Jane Tyrvainen  
Part of Nortons
  Donald A Stillwagon  
it has caused my PC to not boot up, with me getting a blue screen and critical error warning.
  Dick in KC  
It is for Norton Unerase Protection only
  Harry J Smith  
Nothing, just pops up once in a while
  Juan Enrique Perez  
causing blue screen error
  Joe Hewitt  
The process Norton Protection Driver belongs to the software Norton Unerase Protection Driver or Norton Utilities by Symantec Corporation
  gmeades   (further information)

Summary: Average user rating of npdriver.sys: based on 5 votes with 9 user comments. 2 users think npdriver.sys is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous. One user thinks npdriver.sys is dangerous and recommends removing it. 5 users don't grade npdriver.sys ("not sure about it").

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Best practices for resolving npdriver issues

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

npdriver.sys [all]