Troubleshooting Qntmmc.sys BSOD: How To Guide

Last Updated: 03/31/2020
[Reading Time Required: 3.5 minutes]

SYS files such as qntmmc.sys are categorized as Win32 EXE (Driver) files. As a Quantum x500 and x700 Medium changer driver file, it was created for use in Microsoft® Windows® Operating System by Microsoft.

The release of qntmmc.sys introduced for Windows was on 11/08/2006 in Windows Vista. The latest file version for Windows 10 is v10.0.15063.0 (WinBuild.160101.0800) released on 07/29/2015. Qntmmc.sys is found in Windows 10, Windows 8.1, and Windows 8.

In this article, you will find detailed qntmmc.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: qntmmc.sys
File Extension: SYS file extension
Description: Quantum x500 and x700 Medium changer 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: Microsoft Corporation
Software Program: Microsoft® Windows® Operating System
Legal Copyright: © Microsoft Corporation. All rights reserved.
File Details
Character Set: Unicode
Language Code: Neutral
File Flags: (none)
File Flags Mask: 0x003f
Entry Point: 0x50a0
Code Size: 4608


What are qntmmc.sys Error Messages?


Qntmmc.sys Blue Screen of Death (BSOD) Errors

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 These types of qntmmc.sys errors can be cause by hardware problems, outdated firmware, corrupt drivers, or other software-related (eg.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

STOP 0×0000007A: KERNEL DATA INPAGE (qntmmc.sys)
STOP 0x0000007E: SYSTEM THREAD EXCEPTION NOT HANDLED (qntmmc.sys)
STOP 0x0000000A: IRQL NOT LESS EQUAL (qntmmc.sys)
STOP 0x00000050: PAGE FAULT IN A NONPAGED AREA (qntmmc.sys)
STOP 0x0000001E: KMODE EXCEPTION NOT HANDLED (qntmmc.sys)
STOP 0x0000003B: SYSTEM SERVICE EXCEPTION (qntmmc.sys)

It's Critical to Resolve Blue Screen of Death Errors

In the majority of cases, you will encounter qntmmc.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 qntmmc.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 qntmmc.sys Blue Screen of Death error after recent changes.



How to Fix qntmmc.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 qntmmc.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 qntmmc.sys error, please proceed to the Step 2 below.

Step 2: Run SFC (System File Checker) to restore the corrupt or missing qntmmc.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 qntmmc.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 qntmmc.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 qntmmc.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 qntmmc.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 qntmmc.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 qntmmc.sys file version. We maintain a comprehensive database of 100% malware-free qntmmc.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 qntmmc.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\mchgr.inf_x86_ba100587bcd18b1c\
    Windows 8.1: C:\Windows\System32\DriverStore\FileRepository\mchgr.inf_x86_86a2bc5c83e005e4\
    Windows 8: C:\Windows\System32\DriverStore\FileRepository\mchgr.inf_x86_d68c7653ccfc8b46\
    Windows 7: C:\Windows\System32\DriverStore\FileRepository\mchgr.inf_amd64_neutral_407146dba80d1566\
    Windows Vista: C:\Windows\System32\DriverStore\FileRepository\mchgr.inf_be757aa3\
    Show 1 more directory +
    Windows Vista: C:\Windows\System32\DriverStore\FileRepository\mchgr.inf_999a0955\
  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 qntmmc.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 qntmmc.sys Files (Malware-Tested 100% Clean)


CAUTION : We strongly advise against downloading and copying qntmmc.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 qntmmc.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
Windows 8.1
Windows 8
Windows 7
Windows Vista


Files Related to qntmmc.sys


SYS Files Related to qntmmc.sys

File Name Description Software Program (Version) File Size (bytes) File Location
msahci.sys Windows System Configuration Windows Vista 29656 C:\Windows\System32\DriverStore\FileRepository\...
VSTVIA3.SYS HSFHWVIA WDM driver SoftK56 Modem Driver (7.39.06) 239104 C:\Windows\System32\DriverStore\FileRepository\...
country.sys Windows System Configuration Windows 8.1 8960 C:\Windows\System32\
NETwNs32.sys Intel® Wireless WiFi Link Driver Windows 8.1 7518208 C:\Windows\System32\DriverStore\FileRepository\...
wcnfs.sys Windows Container Name Virtualization FS Filter Driver Microsoft® Windows® Operating System (10.0.15063.0) 55808 C:\Windows\System32\drivers\

Other Files Related to qntmmc.sys

File Name Description Software Program (Version) File Size (bytes) File Location
OneX_v1.xsd XML Schema Definition Windows Vista 5957 C:\Windows\L2Schemas\
WWAN_profile_v1.xsd XML Schema Definition Microsoft Office Access 2010 14 6201 C:\Windows\Temp\527D94AF-D053-4381-B105-0D815D5...
WLANAP_profile_v1.xsd XML Schema Definition Windows 10 7548 C:\Windows\L2Schemas\
WLAN_profile_v1.xsd XML Schema Definition Windows 8 15591 C:\Windows\L2Schemas\
WLAN_profile_v1.xsd XML Schema Definition Windows 8.1 16142 C:\Windows\L2Schemas\


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