What is ar5211?

The genuine ar5211.sys file is a software component of Atheros Atheros AR5001A Wireless Network Adapter by Qualcomm.
"ar5211.sys" is the Windows driver for the "Atheros AR5001A" Wireless Network Adapter using the AR5211 chipset. Atheros was purchased by Qualcomm in January 2011 and became a subsidiary of the company. Atheros was a semiconductor chipset developer for wireless networking products and routers. Qualcomm is a global leader in wireless communication products and continues to design innovative technologies for commercial and personal applications.

AR5211 stands for AR5211 Chipset Driver

Ar5211.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 ar5211.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for ar5211 drivers in need of updating

Ar5211.sys file information

The process known as Driver for Atheros (version AR5001 Wireless Network Adapter) belongs to software Atheros Wireless Network Adapter Service or Atheros (version AR5001 Wireless Network Adapter) by Atheros Communications (

Description: Ar5211.sys is not essential for the Windows OS and causes relatively few problems. The file ar5211.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 543,712 bytes (20% of all occurrences), 465,952 bytes, 488,448 bytes, 449,888 bytes or 470,048 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. It is not a Windows system file. The ar5211.sys file is a Microsoft signed file. ar5211.sys appears to be a compressed file. Therefore the technical security rating is 16% dangerous, however you should also read the user reviews.

Recommended: Identify ar5211.sys related errors

Important: Some malware disguises itself as ar5211.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the ar5211.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

Wlan Treiber zb für 3com
Atheros based WLAN Chipset driver
PC kan ohne ihr nicht starten
  Tom Royls  
Atheros wlan driver - size 507424 bytes - version
  Karsten   (further information)
Wireless network driver (Atheros)
wireless lan

Rating chart

Summary: Average user rating of ar5211.sys: based on 8 votes with 6 user comments. 7 users think ar5211.sys is essential for Windows or an installed application. One user suspects danger.

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Best practices for resolving ar5211 issues

A clean and tidy computer is the key requirement for avoiding problems with ar5211. 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 ar5211.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

ar5211.sys [all]