What is peauth?

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

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

Peauth.sys file information

The process known as Protected Environment Authentication and Authorization Export Driver belongs to software Microsoft Windows Operating System by Microsoft (

Description: Peauth.sys is an important part of Windows, but often causes problems. The peauth.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 878,080 bytes (75% of all occurrences) or 586,752 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The peauth.sys file is a Windows system file. Peauth.sys is a trustworthy file from Microsoft. The program has no visible window. The service has no detailed description. peauth.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 peauth.sys related errors

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

PEAuth.sys PEAuth.sys summary: PEAuth.sys, also written as Protected Environment Authentication and Authorization Export Driver, is used to support pcwum, pcwum.dll and PeerDistSh, PeerDistSh.dll for Windows 7, Windows 8, Windows Vista and Windows XP, including 32 and 64 bits operating systems, and programs like Earth 2150, Mozilla and Quick Heal Mobile Security. PEAuth.sys info: 651264 bytes – Size 7/13/2009 4:51:01 PM – Last update Protected Environment Authentication and Authorization Export Driver – Description 6.1.7600.16385 – Version System32winsxsamd64_microsoft-windows-peauth_31bf3856ad364e35_6.1.7600.16385_none_6414380ba35723de – Location PEAuth.sys error symptoms: PEAuth.sys can be easily infected by virus Virus:W97M/Class.EG and spyware Program:Win32/CaiFu for illegal purpose. When there is error in PEAuth.sys, your computer would have following symptoms: PEAuth.sys blue screen of death (BSOD). PEAuth.sys driver can’t work. d3dx9_33.dll is missing from Earth 2150. pcwum, pcwum.dll can’t load when Quick Heal Mobile Security startup. PeerDistSh, PeerDistSh.dll entry point can’t be found during Mozilla installing.
Dangerous. Careful how you see it spelled. As in most of my still unidentified problems, remote, keylog and simply attack, PEAUTH shows as hidden encrypted and stealth. Motive is most likely keylogger, file controling program or dll which removes your privileges and controls hardware.

Summary: Average user rating of peauth.sys: based on 2 votes with 2 user comments. One user thinks peauth.sys is essential for Windows or an installed application. One user thinks peauth.sys is dangerous and recommends removing it.

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Best practices for resolving peauth issues

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

peauth.sys [all]