What is anio?

The genuine anio.sys file is a software component of ANIO Service by Alpha Networks.
Anio.sys is a system driver that belongs to ANIO Service, a program that provides modems and routers with WPA-PSK (Wi-Fi protected access - pre-shared key) support. Drivers enable hardware components to communicate with software without additional programming from the software developer. This file is not a critical Windows file and can be removed if known to create problems. ANIO Service is often installed through 3rd party software, especially modem and router installers from manufacturers such as a D-Link and Belkin. The program can be easily disabled by renaming the file. Alpha Networks is a Taiwanese company that was spun off from the D-Link Corporation in 2003. The company designs and develops networking solutions for home and corporate application. Alpha Networks is based in Hsinchu, Taiwan.

ANIO stands for Alpha Networks Input Output (NT5) Driver

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

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

Anio.sys file information

The process known as ANIO (NT5) Driver belongs to software ANIO Service or ANIO (NT5) Driver by Alpha Networks (

Description: Anio.sys is not essential for Windows and will often cause problems. The file anio.sys is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 28,195 bytes (56% of all occurrences), 28,205 bytes, 29,411 bytes or 24,288 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. It is not a Windows core file. anio.sys appears to be a compressed file. Therefore the technical security rating is 40% dangerous, however you should also read the user reviews.

Recommended: Identify anio.sys related errors

Important: Some malware camouflages itself as anio.sys. Therefore, you should check the anio.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

Until now not dangerous, but impossible to uninstall. Hard to find any information about it.
  Joey11   (further information)
Not Sure Where It Came From But Have Hunch
it come from d-link wireless-lan driver same with ANIWZCSd Service
It's been stated elsewhere that anio.sys comes from a D-Link wireless NIC driver, which fits, as I started getting the error after installing the wireless NIC. Unfortunately, without the NIC, I have no net, so it's not like I can say definitively that it was the driver that caused it -- enabling my net may merely have enabled the problem to be seen.
  CJ   (further information)
it comes from D-link - updated air-plus program
Seems to be associated with D-Link and screws up logging onto E Bay and Google homepage. Attempts to connect at very short intervals, canot uninstall it - yet!
  Mark Board  
associated with D Link Wireless Card
maybe it cames from the d-link driver for wlan (usb-)devices.
installs itself with d-link wifi usb cards
part of d-link wireless PCI installation software (dwlg510)
i have heard that its a d-link wireless program
as soon as i click yes, let it access through my firewall my system crashes
It seems to be installed when you install a D-Link Wireless connection, but as D-Link is made in China maybe it is spyware.
it's a driver connected with installation of D-Link WLAN
  David W.  
Installed as part of the D-Link WLAN Drivers for XP Home/Pro/ Server 2003 R2. Removal is initiated via Add/Remove Programs interface in windows. Core services (D-Link Applications Drivers listed in Add/Remove Programs) must be removed in a REVERSE string of the installation in order to succeed. Without this application the WLAN for D-Link will not acquire signal (NO CONNECTION).
comes with d-link. stop by my firewall and the wireless network works fine
Anio.sys comes with the D-Link wireless NIC driver, and is pretty harmless.
It keeps on bluescreening my new pc... :-(!
installed itself onto my wireless lan utility and subsequently opened opened up an NT logon. It seems to use your wireless connection to access your PC and information by creating screenshots and sending it to the remote server. I don't know how long it was installed in my system or even how long he/she used my drives as "shared files" and peered into my documents.
See D-Link official FAQ. Required for WPA and WPA-PSK
  JCE   (further information)
its apparently a Wi-fi utility prog, gets into yr system when you install Linksys, D-Link or sdimilar wi-fi
  Raybong Dubai  
seems like alot of people think it comes from the Dlink wireless lan. AND they have to type it here even though 10+ people had already done so.
I noticce that when I use mozilla or chrome, it gives me an unsecure certificate/ or ''not safe do you want to continue""
Anio.sys comes with the D-Link wireless
it is part of D-Link wireless, I have no internet without it for Windows 7, need digitally signed driver
I found it in my add or remove programs folder, and wondered what it was; hence found it here and at other sites. I have D-Link wireless, so from what I have seen here and elsewhere I assume it's part of that installation. As far as I can tell, it has had no adverse effects on my computer, and my AVG free security has reported no errors from it.
Error started on 3 PCs right after XP SP3 - seems to be incompatible with ANIO drivers. Stopped after a subsequent update on one, on another I just disabled it. Can't find a really good answer about this anywhere.
Contacted D-Link - they disavow affiliation with ANIO & ANIWZCS programs. I have D-Link wireless adapter - went straight to them to inquire. Believe these programs - installed w/o permission (sneakily-surreptitiously) that fact alone raises suspicions and concerns. Experiencing molasses browsing w/18 mbps internet connection. IObit Uninstaller not only removed program files, but also deep scan removal of all registry traces & affiliated files - which were alarmingly numerous. All gone now. Buh bye.
add/remove it after removing d-link from add/remove list (easy)
It was removable by uninstalling D-Link Air first
  Ulf i Kungsbacka  
I uninstalled all D-Link software and both Anio.sys files disappeared.These programs interfered with and slowed down the web browser. However did not appear malicious, but not sure.

Rating chart

Summary: Average user rating of anio.sys: based on 22 votes with 31 user comments. 5 users think anio.sys is essential for Windows or an installed application. 7 users think it's probably harmless. 4 users think it's neither essential nor dangerous. 3 users suspect danger. 3 users think anio.sys is dangerous and recommend removing it. 11 users don't grade anio.sys ("not sure about it").

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Best practices for resolving anio issues

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

anio.sys [all]