Fix w300mdfl.sys Blue Screen Error Step by Step

Frustrated by the w300mdfl.sys error message? Well, you should want to know what this w300mdfl.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 w300mdfl.sys and the methods to fix it.

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What's w300mdfl.sys File?

As its file extension denotes, w300mdfl.sys is a vital SYS file and it's a component of the software Sony Ericsson W300 USB WMC Modem Filter Driver developed by Windows Software Developer. The latest version of w300mdfl.sys file is V4.34 and MD5 value is 12d415ab0ddd86c42cdc5f120a381f24. Sony Ericsson W300 USB WMC Modem Filter Driver and the Windows will generate w300mdfl.sys error when w300mdfl.sys file cannot be used due to the removal or corruption of w300mdfl.sys file. This error can be seen on Windows XP, Windows Vista, Windows 7, Windows 8 and Windows 10.

w300mdfl.sys file information:
File Name:   
   w300mdfl.sys (Free Scan)
File Description:   
   Sony Ericsson W300 USB WMC Modem Filter Driver
Product Name:   
   Sony Ericsson W300 USB WMC Modem Filter Driver
Product Version:   
   Windows Software Developer
File md5:   
File type:   
   sys file
Security Level(0-5):   
OS Infected:   
   Download w300mdfl.sys Error Free Scan Tool

Why Do I Receive w300mdfl.sys Error?

SYS files like w300mdfl.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 w300mdfl.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 w300mdfl.sys Error Messages

  • PAGE_FAULT_IN_NONPAGED_AREA STOP 0×00000050 w300mdfl.sys.
  • NTFS_FILE_SYSTEM STOP 0×00000024 w300mdfl.sys.
  • DRIVER_IRQL_NOT_LESS_OR_EQUAL STOP 0×000000D1 w300mdfl.sys.
  • SYSTEM_SERVICE_EXCEPTION STOP 0×0000003B w300mdfl.sys

w300mdfl.sys blue screen errors usually happen when you install a new hardware or software. You may receive w300mdfl.sys blue screen errors when you run or close Sony Ericsson W300 USB WMC Modem Filter Driver, start or shut down the computer, or use specific function of Sony Ericsson W300 USB WMC Modem Filter Driver. The time you encounter the error is very important to troubleshoot the problem.

Causes of w300mdfl.sys Error

w300mdfl.sys error can be caused by plenty of reasons. The following are the most common causes of w300mdfl.sys error.

  • Device drivers of w300mdfl.sys is not correctly installed and compatible.
  • The registry settings of w300mdfl.sys are changed or corrupted.
  • Computer malware attacked and damaged w300mdfl.sys file.
  • Other system files are damaged or corrupted after the software that uses w300mdfl.sys is installed.
  • There is a problem with your hard disk or memory (RAM).

How to Fix w300mdfl.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 w300mdfl.sys problem.

Method 1: Check for RAM corruption.

A common culprit in w300mdfl.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 w300mdfl.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 w300mdfl.sys error is caused by a bad RAM and then you will need to replace a new one.

Method 2: Replace corrupted system files with System File Checker.

System File Checker is a utility integrated in Windows system to help users easily scan and replace corrupted system files which may include files related to w300mdfl.sys. If a "protected" file is modified or missing, this utility will restore it from a cached copy to ensure Windows work correctly.


a. Open an elevated command prompt.

Windows Vista and Windows 7

Click Start, click All Programs, Accessories, and then right click Command Prompt and click Run as administrator.

command prompt windows 7

Windows 8, Windows 8.1 and Windows 10

Open Win X menu by holding Windows and X keys, and then click Command Prompt (Admin).

windows8 win x menu

b. After confirming the UAC prompt, type sfc /scannow in the Command Prompt and hit Enter.

sfc windows 7

c. System File Checker is scanning your system and takes some time to complete the repair.

Method 3: Run a virus scan.

Malware infection is one of the most popular cause of various computer problems like w300mdfl.sys error. Computer malware can make their way into the system, change system settings and corrupt system files. When this happens, Sony Ericsson W300 USB WMC Modem Filter Driver and Windows becomes more prone to w300mdfl.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: Update device drivers.

Many issues, conflicts and vulnerabilities of device drivers may result in unexpected problems like w300mdfl.sys error. Drivers are software that enables Windows system to talk and give instructions to hardware devices. Though drivers work correctly one day, they may have problems the next day. Keeping your drivers updated is a way to keep your system error-free.

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 w300mdfl.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 w300mdfl.sys error still persist?

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