Download Rt640x86.sys and Troubleshoot BSOD Errors

Last Updated: 07/03/2019
[Time to Read: ~3-5 minutes]

The development of Realtek 8136/8168/8169 PCI/PCIe Adapters by Microsoft prompted the latest creation of rt640x86.sys. It is also known as a Realtek 8136/8168/8169 NDIS 6.40 32-bit Driver file (file extension SYS), which is classified as a type of Win32 EXE (Driver) file.

Rt640x86.sys was first developed on 07/29/2015 in the Windows 10 Operating System for Windows 10. According to our records, this is the primary and most recent file release from Microsoft.

In this article, you will find detailed rt640x86.sys information, a SYS file troubleshooting guide, and a list of versions that are available for free download.

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File Overview

General Information
File Name: rt640x86.sys
File Extension: SYS file extension
Description: Realtek 8136/8168/8169 NDIS 6.40 32-bit Driver
Object File Type: Driver
File Operating System: Windows NT 32-bit
MIME Type: application/octet-stream
User Popularity Rating:
Developer and Software Information
Software Developer: Realtek
Software Program: Realtek 8136/8168/8169 PCI/PCIe Adapters
Legal Copyright: Copyright (C) 2015 Realtek Semiconductor Corporation. All Right Reserved.
File Details
Character Set: Unicode
Language Code: Neutral
File Flags: Private build
File Flags Mask: 0x003f
Entry Point: 0x7a0c2
Code Size: 489472

What are rt640x86.sys Error Messages?

Rt640x86.sys Blue Screen of Death (BSOD) Errors

There are a number of reasons why you could be encountering issues with rt640x86.sys. Most of the issues concerning SYS files involve Blue Screen of Death (BSOD) errors. These types of rt640x86.sys errors can be cause by hardware problems, outdated firmware, corrupt drivers, or other software-related (eg. Windows update) issues. Some of these errors include:

A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by the following file: rt640x86.sys.

:( Your PC ran into a problem that it couldn't handle, and now needs to restart. You can search for the error online: [BSOD] (rt640x86.sys).

STOP 0x00000050: PAGE FAULT IN A NONPAGED AREA (rt640x86.sys)
STOP 0x0000003B: SYSTEM SERVICE EXCEPTION (rt640x86.sys)
STOP 0×0000007A: KERNEL DATA INPAGE (rt640x86.sys)
STOP 0x0000001E: KMODE EXCEPTION NOT HANDLED (rt640x86.sys)
STOP 0x0000000A: IRQL NOT LESS EQUAL (rt640x86.sys)

It's Critical to Resolve Blue Screen of Death Errors

In the majority of cases, you will encounter rt640x86.sys BSOD errors after you've installed new hardware, software (Windows), or performed a failed Windows Update. In other cases, software corruption caused by a malware infection can lead to rt640x86.sys Blue Screen of Death errors. Therefore, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

GEEK TIP : As a rule of thumb, it's always a good idea to create a Windows "Snapshot" backup / System Restore Point before making any hardware or software changes to your computer. That way, it's very easy to restore your system in the unfortunate event you encounter a rt640x86.sys Blue Screen of Death error after recent changes.

How to Fix rt640x86.sys Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your rt640x86.sys issue. These troubleshooting steps are listed in the recommended order of execution.

Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the rt640x86.sys error, please proceed to the Step 2 below.

Step 2: Run SFC (System File Checker) to restore the corrupt or missing rt640x86.sys file.

System File Checker is a utility included with every Windows version that allows you scan and restore corrupted system files. Use the SFC tool to fix missing or corrupt rt640x86.sys files (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "cmd" but DO NOT PRESS "ENTER".
  3. Press and hold "CTRL-Shift" on your keyboard while pressing "ENTER".
  4. You'll be prompted with a permission dialog box.
  5. In the box, click "YES".
  6. You should have a black screen with a blinking cursor.
  7. In that black screen, type "sfc /scannow" and hit "ENTER".
  8. SFC will begin scanning for rt640x86.sys issues and any other system file problems.
  9. Follow any on-screen commands to complete the process.

Please be aware that this scan might take a while, so please be patient while it is working.

If this Step 2 fails as well, please proceed to the Step 3 below.

sfc /scannow

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many rt640x86.sys error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the rt640x86.sys error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

If Those Steps Fail: Download and Replace Your rt640x86.sys File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate rt640x86.sys file version. We maintain a comprehensive database of 100% malware-free rt640x86.sys files for every applicable version of Windows. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download rt640x86.sys Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy the file into the appropriate directory for your Windows version:

  4. Windows 10: C:\Windows\System32\DriverStore\FileRepository\rt640x86.inf_x86_3849311e1c42e46a\
  5. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve rt640x86.sys problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.

Download rt640x86.sys Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying rt640x86.sys to your appropriate Windows system directory. Microsoft typically does not release Windows SYS files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing rt640x86.sys and all other SYS files for Windows. An incorrectly installed SYS file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10

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