Fix bcm42u.sys Blue Screen Error Step by Step

Frustrated by the bcm42u.sys error message? Well, you should want to know what this bcm42u.sys file is, what causes this error and the most important thing is how to fix this error. In this page, you will find all answers to your questions about this bcm42u.sys and the methods to fix it.

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What's bcm42u.sys File?

As its file extension denotes, bcm42u.sys is a vital SYS file and it's a component of the software Broadcom iLine10(tm) USB Network Adapter developed by Windows Software Developer. The latest version of bcm42u.sys file is and MD5 value is ff90a6b43830a42f989111c53fa11436. Broadcom iLine10(tm) USB Network Adapter and the Windows will generate bcm42u.sys error when bcm42u.sys file cannot be used due to the removal or corruption of bcm42u.sys file. This error can be seen on Windows XP, Windows Vista, Windows 7, Windows 8 and Windows 10.

bcm42u.sys file information:
File Name:   
   bcm42u.sys (Free Scan)
File Description:   
   Broadcom Corporation NDIS 5.0 BCM42U USB miniport driver
Product Name:   
   Broadcom iLine10(tm) USB Network Adapter
Product Version:
   Windows Software Developer
File md5:   
File type:   
   sys file
Security Level(0-5):   
OS Infected:   
   Download bcm42u.sys Error Free Scan Tool

Why Do I Receive bcm42u.sys Error?

SYS files like bcm42u.sys file contain code needed to correctly load and configure Windows operating system. Also, they can be part of hardware drivers and contain various instructions to allow Windows to work flawlessly with hardware and devices.

SYS files run in the kernel-mode that is the highest possible privilege on Windows operating system. Without SYS files like bcm42u.sys, it will be very difficult for your Windows system to run. Any error in these files can cause great harm and data loss.

Popular bcm42u.sys Error Messages

  • PAGE_FAULT_IN_NONPAGED_AREA STOP 0×00000050 bcm42u.sys.
  • NTFS_FILE_SYSTEM STOP 0×00000024 bcm42u.sys.
  • DRIVER_IRQL_NOT_LESS_OR_EQUAL STOP 0×000000D1 bcm42u.sys.
  • SYSTEM_SERVICE_EXCEPTION STOP 0×0000003B bcm42u.sys

bcm42u.sys blue screen errors usually happen when you install a new hardware or software. You may receive bcm42u.sys blue screen errors when you run or close Broadcom iLine10(tm) USB Network Adapter, start or shut down the computer, or use specific function of Broadcom iLine10(tm) USB Network Adapter. The time you encounter the error is very important to troubleshoot the problem.

Causes of bcm42u.sys Error

bcm42u.sys error can be caused by plenty of reasons. The following are the most common causes of bcm42u.sys error.

  • Device drivers of bcm42u.sys is not correctly installed and compatible.
  • The registry settings of bcm42u.sys are changed or corrupted.
  • Computer malware attacked and damaged bcm42u.sys file.
  • Other system files are damaged or corrupted after the software that uses bcm42u.sys is installed.
  • There is a problem with your hard disk or memory (RAM).

How to Fix bcm42u.sys Error?

Keep in mind, never download SYS files from SYS download websites, because they are not verified by their developers and may contain malicious code which lead to further damage to your computer system. We have listed several solutions to troubleshoot your bcm42u.sys problem.

Method 1: Check for RAM corruption.

A common culprit in bcm42u.sys blue screen errors is a bad stick of RAM. When RAM fails, it can cause the system to become unstable. If a new memory is added to your computer, you can remove it to check if it's the cause of your bcm42u.sys error. If the error disappears after the removal, then this new memory is either bad or incompatible with your computer. If there is nothing new added to your computer, then you can test your memory to see if it's bad or not.


a. Press Windows and R keys to bring up Run.

windows r

b. In the dialogue box, type mdsched.exe and press Enter key.


c. Click Restart now and check for problems (recommended).

windows memory diagnostic

d. Now Windows Memory Diagnostic is checking your memory.

checking memory

When the test completes and finds any problem, it's likely that your bcm42u.sys error is caused by a bad RAM and then you will need to replace a new one.

Method 2: Uninstall and then reinstall Broadcom iLine10(tm) USB Network Adapter causing bcm42u.sys error.

If bcm42u.sys error pops up when you're using Broadcom iLine10(tm) USB Network Adapter, then it's worth trying to reinstall Broadcom iLine10(tm) USB Network Adapter or the program from Windows Software Developer.


Windows Vista, Windows 7 and Windows 10:

a. Click Start and click Control Panel.

start control panel windows 7

b. Click Uninstall a program.

win7 control panel programs and features

c. Look for Broadcom iLine10(tm) USB Network Adapter or the program from Windows Software Developer, right click on it and click Uninstall to uninstall it from your system.

uninstall software

d. After the uninstallation, restart your computer and then reinstall the software with your disc or the installer from the official website.

Windows 8 and 8.1:

a. Hover the cursor to the top right corner of the screen to bring up Charms bar and then click Search.

windows 8 charms bar search

b. Click Settings, type uninstall, and click Uninstall a program in the search results.

uninstall windows8

c. Look for Broadcom iLine10(tm) USB Network Adapter or the program from Windows Software Developer, right click on it and click Uninstall to uninstall it from your system.

uninstall software windows8

d. After the uninstallation, restart your computer and then reinstall the software with your disc or the installer from the official website.

Method 3: Run a virus scan.

Malware infection is one of the most popular cause of various computer problems like bcm42u.sys error. Computer malware can make their way into the system, change system settings and corrupt system files. When this happens, Broadcom iLine10(tm) USB Network Adapter and Windows becomes more prone to bcm42u.sys error and even malfunction.


a. Restart your system into Safe Mode with Networking.

b. Open your antivirus or antispyware program. (You can also use this recommended malware detect tool)

c. Run a full scan for your system.

d. After the scan completes, either quarantine or remove any detected malware.

e. Restart your system.

Method 4: Restart your computer.

You can try restarting your computer to fix bcm42u.sys error, as sometimes bcm42u.sys error may be temporary and can be fixed after a system restart.

Method 5: Repair corrupted Windows registry.

As the most important part of Windows operating system, Windows registry is a place that stores all information and configurations of software and hardware. A problematic registry is one of the most common causes of computer errors like bcm42u.sys error. Software installation, uninstallation, malware infection can make changes to the registry. Over time, more and more invalid entries are left and accumulated in the registry and then lead to various errors and problems. The registry needs regular maintenance to keep it tidy and stable. Manual editing the registry is not practical for people with no computer expertise, it's recommended that you use a registry cleaner to do this job.


Note: It requires certain computer knowledge to perform the above solutions. If you're not comfortable with this process, it's recommended that you download and run this automatic error fix utility to fix your PC problems automatically:

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Does bcm42u.sys error still persist?

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