What is fetnd5b?

Fetnd5b.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 fetnd5b.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for fetnd5b drivers in need of updating

Fetnd5b.sys file information

The process known as NDIS 5.0 miniport driver belongs to software VIA Rhine Family Fast Ethernet Adapter Driver Service by VIA Technologies (

Description: Fetnd5b.sys is not essential for the Windows OS and causes relatively few problems. The file fetnd5b.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 42,496 bytes (50% of all occurrences), 40,960 bytes or 41,984 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. The service has no detailed description. The file is not a Windows system file. It is a Microsoft signed file. fetnd5b.sys appears to be a compressed file. Therefore the technical security rating is 14% dangerous, however you should also read the user reviews.

Recommended: Identify fetnd5b.sys related errors

Important: Some malware disguises itself as fetnd5b.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the fetnd5b.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

install drive
its a system file for 10/100 Ethernet Adapter

Rating chart

Summary: Average user rating of fetnd5b.sys: based on 9 votes with 2 user comments. 6 users think fetnd5b.sys is essential for Windows or an installed application. 3 users think it's probably harmless.

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Best practices for resolving fetnd5b issues

A clean and tidy computer is the key requirement for avoiding problems with fetnd5b. 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 fetnd5b.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

fetnd5b.sys [all]