Realtek RTL8139C+ Fast Ethernet NIC Driver Download

RealTek Drivers

The RTL8139C+ Fast Ethernet NIC is a network device manufactured by RealTek. Issues like weak Wi-Fi signal, slow DNS lookup, duplicate IP addresses, slow network and excessive CPU usage can be solved by updating this driver. Visitors have downloaded this file "" 21 times with an aggregate rating of 4 out of 5 stars based on 7 reviews. The uploader reports that this update will work successfully on PCs running Windows Vista and Windows XP. The total disk space used for this update is 2.4 MB.

7 Ratings

Supported Models

Realtek RTL8139/810X Family Fast Ethernet NIC

(MOBILE ASSIST)Realtek RTL8139/810x Family Fast Ethernet NIC

Realtek RTL8139C+ Fast Ethernet NIC

Realtek RTL8169/8110 Family Gigabit Ethernet NIC



Supported Operating Systems

Windows Vista, Windows Vista (64 bit), Windows 2003, Windows 2003 (64 bit), Windows XP, Windows XP (64 bit), Windows 2000, Windows NT4, Windows NT3.51, Windows ME, Windows 98SE, Windows 98, Windows 95, Windows 3.1

File Name


5.621.0304.2005 (2005-03-04) via .inf
5.621.0304.2005 (2005-04-18) via .inf

Uploaded By

DriverGuide (DG Staff Member) on 28-May-2008

Driver Contents File List

The following files are found inside the driver download file.

Name Size Date
6.21/SETUP.TXT 2.5 KB 23 Sep 2003
6.21/Setup.exe 166.9 KB 11 Apr 2001
6.21/Setup.ini 619 bytes 20 Apr 2005
6.21/Win2000/NetrtOEM.inf 165.6 KB 4 Mar 2005
6.21/Win2000/Rtlnic.sys 74.2 KB 4 Mar 2005
6.21/Win2000/ 205.0 KB 9 Mar 2005
6.21/Win98/Netrtl4.inf 11.1 KB 3 Dec 2004
6.21/Win98/Rtlnic4.sys 88.1 KB 3 Dec 2004
6.21/Win98SE/Netrtlx.inf 27.6 KB 4 Mar 2005
6.21/Win98SE/Rtlnic.sys 74.2 KB 4 Mar 2005
6.21/WinMe/Netrtlx.inf 27.6 KB 4 Mar 2005
6.21/WinMe/Rtlnic.sys 74.2 KB 4 Mar 2005
6.21/WinX64/ 219.6 KB 19 Apr 2005
6.21/WinX64/NetrtOEM.inf 190.3 KB 18 Apr 2005
6.21/WinX64/Rtlnic64.sys 106.0 KB 4 Mar 2005
6.21/WinX64/Rtlnicxp.sys 74.5 KB 4 Mar 2005
6.21/WinXP/ 219.6 KB 19 Apr 2005
6.21/WinXP/NetrtOEM.inf 190.3 KB 18 Apr 2005
6.21/WinXP/Rtlnic64.sys 106.0 KB 4 Mar 2005
6.21/WinXP/Rtlnicxp.sys 74.5 KB 4 Mar 2005
6.21/ 1.5 MB 23 Mar 2005
6.21/ 95.8 KB 23 Mar 2005
6.21/ikernel.ex_ 346.6 KB 25 Jul 2002
6.21/layout.bin 417 bytes 23 Mar 2005
6.21/uninicon.ini 28 bytes 14 Jul 2004

How to Update Realtek RTL8139C+ Fast Ethernet NIC Device Drivers Quickly & Easily

Step 1 - Download Your Driver

To get the Realtek RTL8139C+ Fast Ethernet NIC driver, click the green download button above. After you complete your download, move on to Step 2.

If the driver listed is not the right version or operating system, search our driver archive for the correct version. Enter Realtek RTL8139C+ Fast Ethernet NIC into the search box above and then submit. In the results, choose the best match for your PC and operating system.

Tech Tip: If you are having trouble deciding which is the right driver, try the RealTek Driver Update Utility. It is a software utility which automatically finds and downloads the right driver.

To find the newest driver, you may need to visit the RealTek website. Most major device manufacturers update their drivers regularly.

Step 2 - Install Your Driver

Once you have downloaded your new driver, you'll need to install it. In Windows, use a built-in utility called Device Manager, which allows you to see all of the devices recognized by your system, and the drivers associated with them.

How to Open Device Manager

  • In Windows 11, Windows 10 & Windows 8.1, right-click the Start menu and select Device Manager

  • In Windows 8, swipe up from the bottom, or right-click anywhere on the desktop and choose "All Apps" -> swipe or scroll right and choose "Control Panel" (under Windows System section) -> Hardware and Sound -> Device Manager

  • In Windows 7, click Start -> Control Panel -> Hardware and Sound -> Device Manager

  • In Windows Vista, click Start -> Control Panel -> System and Maintenance -> Device Manager

  • In Windows XP, click Start -> Control Panel -> Performance and Maintenance -> System -> Hardware tab -> Device Manager button

How to Install a driver from Device Manager

  1. Locate the device and model that is having the issue and double-click on it to open the Properties dialog box.

  2. Select the Driver tab.

  3. Click the Update Driver button and follow the instructions.

In most cases, you will need to reboot your computer in order for the driver update to take effect.

Tech Tip: Driver downloads and updates come in a variety of file formats with different file extensions. For example, you may have downloaded an EXE, INF, ZIP, or SYS file. Each file type has a slighty different installation procedure to follow.

For more help, visit our Driver Support Page for step-by-step videos on how to install drivers for every file type.

This website is not affiliated with RealTek. All company names/logos are properties of their owners.
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