5 solutions to fix QUOTA UNDERFLOW errors on Windows PCs

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
Affiliate Disclosure
Share this article:

  • QUOTA UNDERFLOW error may be resolved after updating the Windows 10 to the latest version.
  • This error can be caused by an outdated driver, and to fix this error it’s important to have the latest drivers installed. You can download all the necessary driver software from your hardware manufacturer.
  • BSoD errors are tricky because they can be caused by so many factors. If you encounter another one, feel free to go to our BSoD troubleshooting Hub to find a solution.
  • Visit our Windows 10 errors sections for any solutions on such problems.
How to fix QUOTA UNDERFLOW BSoD error
To fix various PC problems, we recommend Restoro PC Repair Tool: This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues and remove viruses now in 3 easy steps:
  1. Download Restoro PC Repair Tool that comes with Patented Technologies (patent available here).
  2. Click Start Scan to find Windows issues that could be causing PC problems.
  3. Click Repair All to fix issues affecting your computer's security and performance
  • Restoro has been downloaded by 0 readers this month.

BSoD errors are usually caused by faulty hardware or a software conflict. These errors can be rather serious and they can even prevent you from accessing Windows 10.

QUOTA UNDERFLOW is one of these errors, but fortunately, there are several solutions available that can help you fix this issue.

How can I fix QUOTA UNDERFLOW BSoD error on Windows 10?

  1. Make sure your Windows is up to date
  2. Update your drivers
  3. Run the Hardware Troubleshooter 
  4. Run the SFC scan
  5. Run DISM
  6. Uninstall any recently added software or hardware
  7. Remove your antivirus software
  8. Check your hardware

How can I fix QUOTA UNDERFLOW errors?

Solution 1 – Make sure your Windows is up to date

Often these issues are caused by hardware or software incompatibility, and in order to prevent these issues from appearing, it’s required that you update Windows 10 regularly.

Microsoft is constantly fixing hardware and software issues, and in order to achieve the most stable and error-free Windows 10 experience it’s crucial that you install updates regularly.

Several users reported that their problem with QUOTA UNDERFLOW error was resolved after updating the Windows 10 to the latest version.

Bear in mind that updating Windows 10 might not fix your problem, but it still a good practice that will keep your free from most incompatibility issues.

Solution 2 – Update your drivers

As we already mentioned, QUOTA UNDERFLOW error can be caused by outdated driver, and in order to fix this error it’s rather important to have the latest drivers installed.

You can download all the necessary driver software from your hardware manufacturer, or by using the Device Manager.

To update driver software from Windows 10, do the following:

  1. Press Windows Key + X and choose Device Manager.
  2. Once Device Manager opens, locate the problematic device, right-click it, and choose Update Driver Software. You’ll have to repeat this step for several devices until you find the one that is causing you problems.

Update drivers automatically

Searching for drivers on your own can be time-consuming. So, we advise you to use a tool that will do this for you automatically.

Using an automatic driver updater will certainly save you from the hassle of searching for drivers manually, and it will always keep your system up to date with the latest drivers.

Tweakbit’s Driver Updater (approved by Microsoft and Norton Antivirus) will help you update drivers automatically and prevent PC damage caused by installing the wrong driver versions. 

After several tests, our team concluded that this is the best-automatized solution.

Here is a quick guide on how to use it:

  1. Download and install TweakBit Driver Updaterdriver updater starting window
  2. Once installed, the program will start scanning your PC for outdated drivers automatically. Driver Updater will check your installed driver versions against its cloud database of the latest versions and recommend proper updates. All you need to do is wait for the scan to complete.
    scanning proccess of Tweakbit driver updater
  3. Upon scan completion, you get a report on all problem drivers found on your PC. Review the list and see if you want to update each driver individually or all at once. To update one driver at a time, click the Update driver link next to the driver name. Or simply click the Update all button at the bottom to automatically install all recommended updates.
    Automatically Update complete
    Note: Some drivers need to be installed in multiple steps so you will have to hit the ‘Update’ button several times until all of its components are installed.

Solution  3 – Run the BSOD Troubleshooter 

The next thing we’re going to try is Windows 10’s own troubleshooting tool. This troubleshooter can resolve various system issues, including BSoD problems.

So, it might be helpful when dealing with the QUOTA UNDERFLOW error, as well.

Here’s how to run Windows 10’s troubleshooter:

  1. Open the Settings app and go to Update & Security section.
  2. Select Troubleshoot from the menu on the left.
  3. Select BSOD from the right pane and click Run the troubleshooter.Troubleshooting BSoD
  4. Follow the instructions on the screen to complete the troubleshooter.

Solution 4 – Run the SFC scan

If the built-in troubleshooter didn’t get the job done, we’re going to try a command-line troubleshooter. The SFC scan goes through your system searching for issues and resolves them on the way.

Maybe it’ll be helpful when dealing with the QUOTA UNDERFLOW error, as well.

Here’s how to run the SFC scan in Windows 10:

  1. Right-click on the Start Menu button, and open Command Prompt (Admin).
  2. Enter the following line and press Enter: sfc/scannow
  3. Wait until the process is done (it may take a while).
  4. If the solution is found, it will automatically be applied.
  5. Now, close the Command Prompt and restart your computer.

Solution 5 – Run DISM

And the third troubleshooting tool we’re going to try is DISM. Deployment Image Servicing and Management (DISM) is a tool that deploys the system image all over again.

So, the QUOTA_UNDERFLOW error may be resolved on the way.

Restoro Scan
Click Start Scan to find Windows issues.
Restoro Fix
Click Repair All to fix issues with Patented Technologies.
Run a PC Scan with Restoro Repair Tool to find errors causing security problems and slowdowns. After the scan is complete, the repair process will replace damaged files with fresh Windows files and components.

We’ll walk you through both standard and the procedure that utilizes the installation media below:

  • Standard way
  1. Right-click Start and open Command Prompt (Admin).
  2. Paste the following command and press Enter:
      • DISM /Online /Cleanup-Image /RestoreHealth
  3. Wait until the scan is finished.
  4. Restart your computer and try updating again.
  • With the Windows installation media
  1. Insert your Windows installation media.
  2. Right-click the Start menu and, from the menu, choose the Command Prompt (Admin).
  3. In the command line, type the following commands and press Enter after each:
    • dism /online /cleanup-image /scanhealth
    • dism /online /cleanup-image /restorehealth
  4. Now, type the following command and press Enter:
    • DISM /Online /Cleanup-Image /RestoreHealth /source:WIM:X:SourcesInstall.wim:1 /LimitAccess
  5. Make sure to change an X value with the letter of the mounted drive with Windows 10 installation.
  6. After the procedure is finished, restart your computer.

Solution 6 – Uninstall any recently added software or hardware

If you installed any software or hardware recently, that can cause QUOTA UNDERFLOW BSoD error to manifest.

Sometimes hardware isn’t fully compatible with your PC and that can cause this BSoD error to appear.

If you remember adding any new hardware such as a new wireless network adapter, hard drive, or graphic card, make sure to remove it and check if your system works normally without it.

Regarding the software, make sure to remove any software that you installed in the last few days.

Some software might not be fully compatible with Windows 10, and this can cause QUOTA_UNDERFLOW BSoD error to appear.

Even recently installed drivers can sometimes cause this issue to occur, so if you updated any drivers recently, try reverting to the older version.

To revert to older version simply uninstall the driver by following these steps:

  1. Press Windows Key + X and select Device Manager from the list of results.
  2. Once Device Manager opens, you need to locate the driver you wish to uninstall.
  3. Right-click the driver and choose Uninstall from the menu.
  4. Restart your computer to complete the process.

After you remove the problematic driver, Windows 10 will automatically install the default driver. If the issue is resolved, this means that the BSOD error was caused by a recently installed driver.

You may try updating your device, but make sure to install the older version of the driver and not the latest one.

Solution 7 – Remove your antivirus software

In some cases, antivirus software can be the main cause for BSoD errors, and many users reported that removing their currently installed antivirus software fixed QUOTA_UNDERFLOW error.

When removing your antivirus, bear in mind that certain parts, for example, registry keys and files can remain on your computer, so it’s best to use a proper uninstaller tool.

Most antivirus companies have these tools on their websites, so feel free to download them.

It’s worth mentioning that almost any antivirus software can cause QUOTA_UNDERFLOW BSoD error to appear.

But most commonly these types of problems are caused by McAfee, Avast, AVG or and sometimes Kaspersky.

Even if you don’t use any of the aforementioned tools, you should still try removing your antivirus software and check if that fixes this issue.

Solution 8 – Check your hardware

Users reported that QUOTA_UNDERFLOW BSoD is often caused by a hardware failure. According to users, after replacing their RAM or SSD, the Blue Screen of Death error was permanently fixed.

It’s worth mentioning that almost any hardware component can cause a BSoD to appear, so in order to find a faulty component, you need to perform a thorough investigation.

There are certain tools, most notably MemTest86+ that you can use to test your RAM, and all that you have to do is to download the tool, install it on a USB flash drive, and boot your PC from that flash drive.

After your computer boots, start MemTest86+ and let it run for several hours. If it reports any errors, it means that your RAM module isn’t working properly and it should be replaced.

QUOTA UNDERFLOW BSoD error can be troublesome, and in most cases, it’s caused by a hardware failure, so you’ll have to locate the faulty hardware and replace it.

Before replacing your hardware, make sure to try all other solutions mentioned in this article.

FAQ: Learn more about QUOTA_UNDERFLOW error

  • What is the QUOTA_UNDERFLOW error?

The QUOTA UNDERFLOW error is a BSoD error that can be caused by incorrectly configured, old, or corrupted device drivers, corrupted registry from a recent software change, virus, or malware infection and many other issues.

  • How can I fix the QUOTA_UNDERFLOW error?

First, make sure your Windows is up to date, then, update your drivers. You can solve the problem completely with our complete, step-by-step guide.

  • What is a BSOD Error 0x21?

Error Code 0x21 is also known as QUOTA_UNDERFLOW. The QUOTA_UNDERFLOW bug check has a value of 0x00000021.

idee restoro Still having issues? Fix them with this tool:
  1. Download this PC Repair Tool rated Great on TrustPilot.com (download starts on this page).
  2. Click Start Scan to find Windows issues that could be causing PC problems.
  3. Click Repair All to fix issues with Patented Technologies (Exclusive Discount for our readers).
Restoro has been downloaded by 0 readers this month.

Editor’s Note: This post was originally published in October 2018 and has been since revamped and updated in April 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in June 2016 and was revamped and updated in June 2020 for freshness, accuracy, and comprehensiveness.
Was this page helpful?
Thanks for letting us know! You can also help us by leaving a review on MyWOT or Trustpillot.
Get the most from your tech with our daily tips
Tell us why!