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Hive ransomware on Exchange servers

Hive ransomware has been targeting Microsoft exchange servers lately vulnerable to ProxyShell security issues in order to deploy various backdoors. Once the backdoor has been placed various attacks can be performed including but not limited to network reconnaissance, stealing admin accounts, taking valuable data, and even installing and deploying file-encrypting algorithms.

hive ransomware

ProxyShell wide abuse

ProxyShell is a set of three vulnerabilities in the Microsoft Exchange Server that allows remote code execution without authentication on vulnerable deployments. The flaw has been used in past by various ransomware like Conti, BlackByte, Babuk, Cuba, and LockFile.

Security vulnerabilities have been reported to be fully patched on May 2021 but how Hive was able to still be successful in exploiting PowerShell and infiltrating into the system there seems to be still some unpatched and open issues.

Hive

Hive has gone a long way since it was first observed in the wild back in June 2021, having a successful start that prompted the FBI to release a dedicated report on its tactics and indicators of compromise.

In October 2021, the Hive gang added Linux and FreeBSD variants, and in December it became one of the most active ransomware operations in attack frequency.

Last month, researchers at Sentinel Labs reported on a new payload-hiding obfuscation method employed by Hive, which indicates active development.

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Device frequently disconnects from hotspot
As you know, Windows 10 comes with the option to create Mobile Hotspot for other devices. This allows you to share your Ethernet connection. However, there are times when one of your devices might fail to reconnect to the mobile hotspot again. For instance, you moved out of the Wi-Fi range because you have somewhere to be and whatnot and when you’re back you find that you are now unable to reconnect to the Windows 10 Hotspot or the shared network. Although you can always restart the mobile hotspot to resolve the problem, however, it might only be a temporary fix. So in this post, you will be given options for a much better solution to the problem. This kind of problem seems unusual and does not occur that often. To fix it, you can try to set up DNS on your Windows 10 device and then configure the settings on the mobile device. It seems that what’s happening here is that the mobile device is unable to lock on to the Mobile Hotspot when the IP address changes for some reason.

Option 1 – Try changing the DNS settings on your laptop

In this option, you need to make sure that IPv4 and IPv6 are selected on your Ethernet connection. You also have to change the Preferred DNS server as well as the Alternate DNS server to 8.8.8.8 and 8.8.4.4, respectively. You also have to validate the settings before you exit just to ensure that you’ve entered everything correctly. After that, open Command Prompt and run the ipconfig command and then take note of the IP address, Gateway DNS 1 and DNS 2.

Option 2 – Try changing the Wi-Fi settings on your mobile device

This option should be mostly the same on all your mobile devices. And given that OEMs build their customization and skin, you might have to fiddle around a little to get the settings. Refer to the steps below to change the Wi-Fi settings:
  • Go to the Settings of your mobile device and tap on Wi-Fi.
  • Then click the Mobile Hotspot connection that you’ve created on your laptop.
  • After that, input the password and tap the Advanced options.
  • From there, tap on IP settings and select the Static option instead of DHCP.
  • Now you have to enter the IP address, Gateway, DNS 1, and DNS 2 of the laptop you’ve taken note of earlier and that’s it.
Note: If you are already connected to the Mobile Hotspot, long press on the Wi-Fi network and select the Modify Network option and then follow the steps given above to change from DHCP to static. Once you’re done, your mobile device should now be able to connect to the Windows 10 Mobile Hotspot all the time.
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Fix Sechost.dll missing error in Windows 10
If you are facing a missing sechost.dll error in your Windows 10, welcome, you have come to the right place to solve it and get back your computer in working order. Sechost.dll is a file that allows other programs to function and complete their tasks as well as control and change the behavior of other programs. The file is found in Windows subfolder System32, it is a completely safe file and should not be deleted. Sometimes however various other reasons can corrupt it or delete it. This guide will lead you to common solutions on how to get file back up and running.
  1. Update device driver

    Have you installed a new device and all of a sudden you get the error message that Sechost is missing? Update device driver, it is possible that the file has been corrupted or replaced with an older version and therefore reported as missing. Update device driver to lastest version and issue should run away.
  2. Re-register file via command prompt

    If Sechost got corrupted re-registering will solve the issue, press ⊞ WINDOWS + X and choose Command prompt (administrator), click on it. type regsvr32 sechost.dll and press ENTER Reboot your PC
  3. Reinstall application

    Usually, Sechost gone bad or missing is due to the installation of another application that corrupts the file. Reinstall the application to try to solve errors. In order to properly reinstall the application first use the control panel to remove it completely from the system and then install it again, hopefully, this time correct version of Sechost.dll will be installed in the system.
  4. Check your hard drive

    In some cases, a hard drive malfunction can cause several files to be corrupted or gone missing. To eliminate hard drive malfunction run check disk from Windows on C drive to check it and find if there are any errors.
  5. Uninstall Windows update

    Same as with some application, even Windows update could corrupt some files due to update not being properly downloaded. Try uninstalling the latest update and revert to the previous Windows state, then update it again.
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How to Fix ntdll.dll crash Error on Windows
DLL files, also known as Dynamic Link Libraries are external parts of applications that run on Windows as well as other operating systems. Almost all applications are not complete in themselves and store code in different files. In this post, we will be discussing one DLL file called ntdll.dll. It is described as “NT Layer DLL” which means that it contains some Kernel functions that help in the normal functioning of the Windows operating system. It is created by Windows in the System32 folder when the OS gets installed. This file can serve different programs simultaneously by providing them with different Kernel functions which support the programs’ performance. However, if you encounter the ntdll.dll file error on your Windows 10 computer, read on as this post will guide you in fixing the problem.

Option 1 – Try to re-register the ntdll.dll file

You may have to re-register the ntdll.dll file using the regsvr32.exe before you can successfully install the program and fix ntdll.dll file crash error. The Regsvr32 tool is a command-line utility that can be used to register and un-register the OLE controls like DLL and ActiveX (OCX) control in the Windows operating system. Follow the steps below to use it.
  • Open Command Prompt as admin from the WinX menu.
  • Next, type the following commands in the elevated Command Prompt and hit Enter to execute the command. This will re-register the affected DLL file using the Windows operating system tool, regsvr32.exe.
    • exe /u ntdll.dll
    • exe ntdll.dll
  • You should see a message saying, “DllRegisterServer in vbscript.dll succeeded” if the Regsvr32 tool was able to run successfully. After that, try to install the program again and see if it now works.

Option 2 – Disable problematic Internet Explorer add-ons

There are instances when some add-ons in the Internet Explorer browser can cause the ntdll.dll file crash error. Thus, you need to disable some add-ons in Internet Explorer and then check if it fixes the problem.

Option 3 – Try running the DISM tool

You might want to repair potentially corrupted files in your system as having them could also trigger the ntdll.dll file crash error. To repair these corrupted system files, you can run the DISM commands:
  • Tap the Win + X keys and click on the “Command Prompt (Admin)” option.
  • After that, input each one of the commands listed below sequentially to execute them:
    • Dism /Online /Cleanup-Image /CheckHealth
    • Dism /Online /Cleanup-Image /ScanHealth
    • Dism /Online /Cleanup-Image /RestoreHealth
  • Once you’ve executed the commands given above, restart your computer and check if the DCOM error is now fixed.

Option 4 – Try to run the Program Compatibility Troubleshooter

You might also want to run the Program Compatibility Troubleshooter. This built-in troubleshooter is available in the Windows Update & Security section. From there, select Troubleshoot. This will find a list of programs for you and since you have already downloaded the driver files, just click on Not Listed located at the top of the program list. After that, browse and select the driver files and then let the program do its job.

Option 5 – Try to replace the DLL file with a trusted source

  • First, you need to get the new DLL file from another computer with preferably the same file version number.
  • After that, you need to boot your PC into Safe Mode and navigate to the paths listed below and then replace the file using a USB drive or other external storage devices.
    • x86: This PC > C:WindowsSystem32
    • x64: This PC > C:WindowsSysWOW64
  • Next, type “cmd” in the Cortana search box and right-click on Command Prompt, and select “Run as administrator” to open it with administrator privileges.
  • Now type the “regsvr32 ntdll.dll” command and hit Enter.
  • Restart your PC and check if the error is now fixed.

Option 6 – Try scanning your computer using Windows Defender

The ntdll.dll file crash error might also be infected with malware or virus and to eliminate it, you have to scan your computer using security programs like Windows Defender.
  • Tap the Win + I keys to open Update & Security.
  • Then click on the Windows Security option and open Windows Defender Security Center.
  • Next, click on Virus & threat protection > Run a new advanced scan.
  • Now make sure that Full Scan is selected from the menu and then click the Scan Now button to get started.
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Override default Regional settings in Windows
As you probably know, Windows 10 does not offer lots of choices for its Regional settings depending on where you are and what locale you work with or belong to. The standard region settings for Windows 10 allow users to select one set of formats for the calendar and more. However, this has somewhat changed in the Windows 10 v1809. If you don’t want such a change, you can just override the default regional format settings in the Windows 10 Improved local experience. So in this post, you will be guided on how you can do such a thing. Follow the given instructions below to override the default Regional Format settings in Windows 10. Step 1: Go to Settings > Time and Language > Region. Step 2: From there, the default region is what Windows and apps might use to provide you with local content. However, this won’t be much of use if you work for a different locale and need to have different format settings like Calendar, Dates, Times, Currency, and First day of the week, all of which you can modify under the Regional format. Step 3: You need not reboot your Windows 10 computer after changing. On the other hand, some of the apps will have to close and launch again in order to apply the new format. Thus, if you need to use apps that are of different locales, you will only see the changes after you re-launch the app. Note: You can also select a different language that makes more sense to you. In other words, if you prefer more common words to standard words for your Windows 10 computer, then this is definitely the way to do it. This local format will be used for messages, menus, navigation, settings, and other topics. Step 4: Look for a link that says “Add a Windows display language with local experience packs” under Languages. In case you don’t know, Local Experience Packs are Microsoft Store apps that deliver Windows display language quality improvements. So once you click the link, it will download the packs from the Microsoft Store. In addition, Windows has already begun using AI or Artificial Intelligence as well as neural network-based Machine Learning for Windows localization. And as the number increase, the Machine language improvements and feedback from users will help in making the translations a lot better and make them available to even more languages. All in all, it’s pretty much an interesting and a good move for Microsoft as the demands for topics and machines to be available in local languages have been increasing for the past couple of years.
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How to Fix Media disconnected error message on Windows 10
A computer with no internet connection is like a mobile phone that can’t call nor text though you can still use it for other things. So if you are having problems with your computer’s internet connection, worry not as there are some basic things you can try before you go over the actual troubleshooting. Just make sure that you really have working internet. To verify it, try connecting your other devices. Aside from that, you must also make sure that your computer is connected properly over cable or connected to the router over the Wi-Fi. Once you have all these things covered, now’s the time to start troubleshooting the problem with the help of the instructions prepared below. To be more specific, this guide will walk you through what you can do when you encounter a particular internet connection problem where you get the Media State Media disconnected error message on your Windows 10 computer.

Before you troubleshoot the problem, you need to first check the internet connection status on your computer. To do that, follow these steps:

  • Type in “cmd” in the Cortana search box.
  • From the search results, right-click on Command Prompt and select “Run as administrator” from the context menu.
  • After opening Command Prompt with administrator privileges, type in the ipconfig /all command and hit Enter.
  • After you enter the command, you will see a list of all the connected media like the Ethernet, Wi-Fi along with its status, and more. From there, you need to check everything closely. I notice a message that says, “Media State . . . . . Media disconnected”, then your internet connection is indeed having issues.
Refer to the options below to fix the Media State Media disconnected error message on your Windows 10 PC.

Option 1 – Try resetting WINSOCK and IP Stack

  • Type in “cmd” in the Cortana search box.
  • From the search results, right-click on Command Prompt and select “Run as administrator” from the context menu.
  • After opening Command Prompt, type in each one of the commands listed below
    • netsh winsock reset catalog – This command will reset the WINSOCK entries.
    • netsh int ipv4 reset reset.log – This command will reset the IPv4 TCP/IP stack.
    • netsh int ipv6 reset reset.log – This command will reset the IPv6 TCP/IP stack
  • Once you’ve executed the commands listed above, restart your PC to successfully apply the changes made.

Option 2 – Check if your Network Adapter is disabled

If you’ve disabled the network adapters on your computer, then it’s most likely the reason why you’re getting the Media State Media disconnected error message. Thus, you need to enable it back.
  • Open Settings and go to Network and Internet > Select Ethernet > Change adapter options.
  • From there, right-click on the adapter and enable it.

Option 3 – Check the Wi-Fi Properties

Though this case is not common, Wi-Fi sharing has actually caused issues for some users. That’s why you need to check the Wi-Fi properties. Go to Network Connections and right-click on Wi-Fi and select Properties. From Properties, go to the Sharing tab and select the first option and click OK.

Option 4 – Try updating the Network driver

  • Tap the Win + R keys to open the Run dialog box and then type in devmgmt.msc and tap Enter or click OK to open the Device Manager.
  • Expand the section for the outdated device drivers.
  • And then select the Network driver or any other outdated driver(s) and right-click on it/them.
  • From the drop-down menu, select the Update Driver option and follow the on-screen instructions to install the latest version of the driver.
  • Then also click on the option, “Search automatically for updated driver software.
  • Restart your PC after the installation.
Note: If updating the Network driver didn’t work, you can go to the website of your PC manufacturer and look for the support section where you can download the drivers for your computer. You just need to take note of your PC’s correct model and model number so you can find the appropriate driver.
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Fix CompareExchange128 error
During Windows 10 installation, you will see all the beautiful user interfaces, however, what’s more, important are the drivers, your processor, and free storage disk in order for the installation to be successfully completed. So if you are getting the CompareExchange128 error during the installation of Windows 10, this means that the CPU lacks a very important instruction known as “CMPXCHG16B”. Thus, if you don’t have CMPXCHG16B, then it will result in the CompareExchange128 error when you install Windows 10. In fact, CMPXCHG16B, PrefetchW as well as LAHF/SAHF is a criterion for you to be able to use Windows 10 64-bit version when upgrading from an earlier version of Windows. So what exactly is the CMPXCHG16B instruction? The CMPXCHG16B instruction is the one that performs an atomic compare-and-exchange on 16-byte values. This instruction can also be referred to as “CompareExchange128”. The atomic compare-and-exchange means that the CPU compares the contents of a memory location with a given value. So if the values are the same, it modifies the contents of that memory location to a new given value. Note that this kind of issue only happens to the 64-bit Windows 10 version and the only way to resolve it is by getting an update on the hardware level from the OEM. On the other hand, if nothing really works, it’s maybe time for you to get a new CPU but before you resort to that, in the meantime, you can try following the options given below to fix the CompareExchange128 error during the installation of Windows 10.

Option 1 – Try to update the BIOS and Chipset Drivers

One of the best things you can do to fix the CompareExchange128 error is by updating the BIOS and chipset drivers which is why you need to check if your OEM has an update available for your computer’s BIOS as well as the related chipset drivers. But before that, you need to first check the BIOS version. To do so, follow these steps:
  • Type “msinfo32” in the search bar and hit Enter to open the System Information Tools.
  • After opening the System Information Tools, check the BIOS version.
  • Then take note of that BIOS version. You also need to use the BIOS utility that came with your computer and use it for the upgrade. Note that it is different for every computer and if you don’t have it, you can just go to the OEM website and see if there is an option to download it there.

Option 2 – Try to downgrade to the 32-bit Windows 10 version

If option 1 didn’t work as the BIOS update is not available, you can also try downgrading to the 32-bit version of Windows 10. Keep in mind that this will bring restrictions on the amount of RAM installed and other places but that won’t be a problem as you can still switch.

Option 3 – Try buying a new hardware

If none of the first two options didn’t work for some reason then maybe it’s time for you to purchase new hardware especially if your computer is way too old. In such cases, it’s better to buy new hardware or better yet, a new computer that can keep up for the next couple of years.
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How to Fix Unable to contact your DHCP Server
If your IP address expires, you will most likely experience interruptions when browsing the web. In such cases, you have to release and renew the IP address by executing the following commands:
  • ipconfig /release
  • ipconfig /renew
So if you are trying to renew the IP address of your Windows 10 computer using the commands given above but you encounter an error message instead that says, “Unable to contact your DHCP Server”, then you’ve come to the right place as this post will guide you in fixing this error. This kind of error indicates that the NIC can’t communicate with the DHCP server which is why it’s not able to release new IP addresses. It could be due to many reasons. To fix this error, you can try to roll back, update or reinstall the Network Adapter drivers. You could also run the built-in Network Adapter troubleshooter, as well as start or restart the DHCP client service.

Option 1 – Try to rollback your Network driver

If you have updated the driver software as of late and you suddenly got this error, you might have to roll back the device driver – in other words, switch back to the previous working version. To do that, follow these steps:
  • Tap the Win + R keys to launch the Run window and then type in the “devmgmt.msc” command and hit Enter to open the Device Manager window.
  • Under the Device Manager, you will see a list of drivers. From there, look for the Network Adapters and expand it.
  • Next, select the driver entries that are labeled appropriately other than anything in the context of the WAN Miniport.
  • Then select each one of them and double click to open a new mini window.
  • After that, make sure that you’re on the Driver tab and if you are not, just navigate to it then click the Roll Back Driver button to switch back to the previous version of your Network adapters.
  • Now restart your computer to successfully apply the changes made.

Option 2 – Try to update the Network drivers

If rolling back to the previous version of the Network adapter drivers didn’t help, then you need to update them instead. To do so, here’s what you have to do:
  • Tap the Win + R keys to launch the Run window and then type in the “devmgmt.msc” command and hit Enter to open the Device Manager window.
  • Under the Device Manager, you will see a list of drivers. From there, look for the Network Adapters and expand them.
  • Then right-click on each one of the Network drivers and update them all.
  • Restart your PC and see if it helped in fixing the BSOD error.
Note: If updating the network drivers didn’t help in fixing the problem, you can also try to uninstall the very same drivers and restart your Windows 10 PC. After that, the system itself will reinstall the drivers you just uninstalled. Alternatively, you can also download and install the drivers from the manufacturer’s website directly.

Option 3 – Run the Network Adapter troubleshooter

Running the built-in Network Adapter troubleshooter can also help in fixing the “Unable to contact your DHCP Server” error. To run the Network Adapter Troubleshooter, refer to these steps:
  • Open the Search bar on your computer and type in “troubleshoot” to open the Troubleshoot settings.
  • Next, scroll down and select the “Network Adapter” option from the right pane.
  • Then click on the Run Troubleshooter” button.
  • After that, your computer will check for any possible errors and will pinpoint the root cause of the problem if possible.
  • Restart your computer.

Option 4 – Try disabling the IPv6 in the Network Center

  • Tap the Win + X key combination and click on Network Connections.
  • This will open the Settings app on a specific page. Now on the right-side panel, click on the Network and Sharing Center link.
  • After that, it will open the Control Panel and from there, click on the network that your computer is connected to and then click on Properties.
  • Next, uncheck the entry that says, “Internet Protocol Version 6 (TCP/IPv6)” in the list that populates.
  • Now click on OK and close all other windows.
  • Restart your computer and see if the error is now fixed.

Option 5 – Start or restart the DHCP client service

If the DHCP client service is either inactive or stopped, you can try to start or restart it to resolve the error. You can do this via the Services Manager.
  • Tap the Win + R keys to open the Run utility.
  • Then type “services.msc” in the field and tap Enter or click OK to open the Services Manager.
  • After that, look for the DHCP client service from the list of services displayed.
  • Once you found it, right-click on it and select the Start or Restart option.
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4 Methods of Fixing Error Code 48

Error Code 48 – What is it?

Error Code 48 is a device driver error code that users can encounter on any Windows 2000 operating system and later versions.

It occurs when the connected peripheral device cannot be run as the Windows operating system’s driver required to install the programs for peripheral devices has either been corrupted or is incompatible with the system.

It prompts the user with the following message on the screen:

The software for this device has been blocked from starting because it is known to have problems with Windows. Contact the hardware vendor for a new driver. (Code 48)

Solution

driverfix boxError Causes

Like most other Windows error codes, error code 48 is triggered by the following factors.

  • Corrupted system registry files
  • Presence of viruses in the device
  • The device driver is out-of-date
If this error code is not rectified, it could give birth to other driver device errors such as error code 52.

Further Information and Manual Repair

Method 1 – Run a complete scan for malware and spyware

Identifying and removing the viruses in the system registry and in the connected devices is the easiest method to fix the corrupted registry files.

Viruses such as spyware and malware infect the registry entries and eat up the files that lead to incomplete or missing data. This creates problems for installing external devices as the driver required to install them is not complete.

Method 2 – Use System Restore

You can also use system restore to eliminate the problem. Here is how you can use it:

  • Log in using an Administrator account
  • Click ‘Start’ button and select All Programs > Accessories > System Tools > System Restore
  • Click ‘Restore my computer to an earlier time’ and click ‘Next’
  • Select the last Windows to restore point from the ‘On this list, click a restore point’ list, and click ‘Next’
  • Click ‘Next’ on the confirmation window to proceed
  • Restart your PC after restoration is complete

By restoring the system via the last saved system checkpoint, you can obtain undamaged Windows system registry files that can help resolve the error code.

Method 3 – Manually uninstall and reinstall the device driver

Since Error Code 48 is due to a missing or an out-of-date device driver, uninstalling and then reinstalling the device driver can help solve the error.

You can do this by firstly logging in as Administrator and opening Device Manager. Select the device that is causing the problem and double click it; make sure that the peripheral is connected properly to the PC.

Upon opening, click on the ‘Driver’ tab and then select ‘Update Driver’. Make sure to refer to the system documentation that you received with your PC or computer to check for the motherboard details and driver specifics.

Method 4 – Use software to automatically download the driver

Manually uninstalling and reinstalling the driver will do the trick; however, it may be time-consuming especially when you would have to resort to your hardware user manual. Therefore, using a program such as DriverFIX can save you a lot of time and frustration in having your device work properly on your computer. DriverFIX, with its user-friendly approach to help you fix your PC issues, comes with an integrated database that detects which drivers you need to reconfigure within just a few seconds and downloads it automatically. It further ensures that your drivers are installed in their entirety leaving no room for any incomplete files to remain that create Error Code 48. It also has the added advantage of being able to backup and restores your files should there be the slightest possibility of system file damage. DriverFIX is the answer to fixing your PC error codes accurately and quickly. Click here to download DriverFIX to fix Error Code 48 quickly and effectively!
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SYSTEM_THREAD_EXCEPTION_NOT_HANDLED CMUSBDAC.sys
If you encounter a Blue Screen error that points out to the CMUDA.sys, read on as this post will guide you in fixing it. The CMUDA.sys file is a Windows operating system driver file that is related to the USB Device Audio capabilities of a computer. There are times when this file causes Blue Screen error due to some conflicts in RAM or some incompatible firmware or hard disk issues, corrupted drivers or malware infection, and so on. There are various Blue Screen errors that are related to the CMUDA.sys file such as:
  • KMODE EXCEPTION NOT HANDLED
  • PAGE FAULT IN A NONPAGED AREA
  • IRQL NOT LESS OR EQUAL
  • SYSTEM THREAD EXCEPTION NOT HANDLED (CMUSBDAC.sys)
In most cases, the CMUDA.sys file usually triggers the SYSTEM_THREAD_EXCEPTION_NOT_HANDLED Blue Screen error. Although this Blue Screen error may seem complicated, its workarounds are straightforward so you won’t have any problems in following them.

Option 1 – Try to update or rollback your device drivers

If the first option didn’t work for you, then it’s time to either update or roll back the device drivers. It is most likely that after you updated your Windows computer that your driver also needs a refresh. On the other hand, if you have just updated your device drivers then you need to roll back the drivers to their previous versions. Whichever applies to you, refer to the steps below.
  • Open the Devices Manager from the Win X Menu.
  • After opening the Device Manager, locate the device drivers that are marked with a small yellow exclamation mark icon and right-click on each one to open their Properties. On the other hand, you can also look for sub-entries under Sound, video, and game controllers like the C-Media USB Audio Class
  • After that, switch to the Driver tab and click on the Uninstall Device button.
  • Follow the screen option to completely uninstall it.
  • Finally, restart your computer. It will just reinstall the device drivers automatically.
Note: You can install a dedicated driver on your computer in case you have it or you could also look for it directly from the website of the manufacturer. You can download the as C-Media USB Audio Class driver from the cmedia.com website.

Option 2 – Try to recreate the CMUDA.sys file

The first thing you can try is to recreate the CMUDA.sys file. Every time your Windows 10 PC boots up, it looks for all the system drivers in place and if it is unable to find them, it tries to create them. Which is why if you remove your corrupt driver file, chances are, you might get a fixed file recreated just for you. How? Refer to the steps below.
  • Boot your Windows 10 PC in Safe Mode.
  • Then open File Explorer and navigate to this location: C:/Windows/System32/drivers
  • From there, look for the file named sys and rename it to CMUDA.old.
Note: As you can see, the file’s extension has changed from .sys to .old.
  • Now restart your computer and check if the CMUDA.sys Blue Screen error is now fixed.

Option 3 – Run the Blue Screen Troubleshooter

The Blue Screen troubleshooter is a built-in tool in Windows 10 that helps users in fixing BSOD errors. It can be found on the Settings Troubleshooters page. To use it, refer to these steps:
  • Tap the Win + I keys to open the Settings panel.
  • Then go to Update & Security > Troubleshoot.
  • After that, look for the option called “Blue Screen” on your right-hand side and then click the “Run the troubleshooter” button to run the Blue Screen Troubleshooter and then follow the next on-screen options. Note that you might have to boot your PC into Safe Mode.
On the other hand, you can also try running the online Windows 10 Blue Screen troubleshooter from Microsoft. It is a wizard that could help you fix any Stop errors related to the CMUDA.sys file and will offer you helpful links as you use it.

Option 4 – Try running the DISM tool

You can try running the Deployment Imaging and Servicing Management or DISM tool to fix the Wdf01000.sys Blue Screen error. Using this built-in tool, you have various options such as the “/ScanHealth”, “/CheckHealth”, and “/RestoreHealth”.
  • Open the Command Prompt with admin privileges.
  • Then type in the following commands and make sure to hit Enter right after you type each one of them:
    • Dism /Online /Cleanup-Image /CheckHealth
    • Dism /Online /Cleanup-Image /ScanHealth
    • exe /Online /Cleanup-image /Restorehealth
  • Do not close the window if the process takes a while as it will probably take a few minutes to finish.

Option 5 – Run System Restore

Running System Restore might also help in fixing Blue Screen errors related to the CMUDA.sys file.
  • Tap the Win + R keys to open the Run dialog box.
  • After that, type in “sysdm.cpl” in the field and tap Enter.
  • Next, go to the System Protection tab then click the System Restore button. This will open a new window where you have to select your preferred System Restore point.
  • After that, follow the on-screen instructions to finish the process and then restart your computer and check if the problem is fixed or not.
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Cannot find a system image on this computer
If you are trying to restore your computer using a System Image that has been created by the Windows Backup and Restore tool but encountered an error message instead that says, “Windows cannot find a system image on this computer”, you’ve come to the right place as this post will walk you through in fixing this error. Here’s the complete context of the error message:
“Windows cannot find a system image on this computer, Attach the backup hard disk or insert the final DVD from a backup set and click Retry. Alternatively, close this dialog for more options.”
In the error message, you are offered two choices – to either Retry or Cancel the operation. You can try to select Retry to try again but you will most likely get the same error if you do so. This kind of error can occur if the name of the WindowsImageBackup folder or any of its sub-folders has been modified. On the other hand, this error can also pop up if this folder or any of its sub-folders have gone missing or have become corrupted. To resolve the error, you can try to move the WindowsImageBackup folder or check its sub-folders. You can also try to isolate the System Image file or rename the System Image folder or remove all the unwanted sub-folders as well as use Command Prompt in Repair mode.

Option 1 – Try to move the WindowsImageBackup folder

The WindowsImageBackup folder must be stored in the root of the volume where it is stored, in line with the functioning of the System Restore utility. For example, if the WindowsImageBackup folder is stored in the “C:/Backups/System Restore Backups/New” location, then you have to move it to the C: drive as well.

Option 2 – Try to check the subfolders of the WindowsImageBackup folder

The classification of folders and files plays an important part to restore in restoring a computer from a System Restore point. Thus, if have modified the names of any files or folders inside the WindowsImageBackup folder, then you need to set the defaults. After that, run System Restore again and check if it fixes the error.

Option 3 – Try to isolate the System Image file

If the System Image file is stored in a USB storage device along with various System Restore images, then it’s no wonder why you’re getting this error. To set things right, you have to make sure that the System Restore image you wish to restore your computer from, is the only one that’s present at the root of the USB storage device.

Option 4 – Try renaming the System Image folder

If you have renamed the System Image folder prior to running System Restore, then it is most likely the reason why you’re getting the “Windows cannot find a system image on this computer” error. This error pops up because the System Restore utility in Windows 10 looks out for the WindowsImageBackup folder so if you have renamed it, you need to change its name back to what it originally was to fix the error.

Option 5 – Try to remove all the sub-folders of the WindowsImageBackup folder

If you have stored some foreign files inside the WindowsImageBackup folder, you need to get rid of them right away and return the folder to its default state as this folder must be left alone and should not be meddled with if you want to run System Restore smoothly.

Option 6 – Try to use Command Prompt in Repair Mode

  • Open Command Prompt while your computer is in the Repair Mode.
  • Next, type and enter this command where you need to replace “<Partition Letter>” with your drive’s letter: dir <Partition Letter>
  • After you’ve found the WindowsImageBackup folder in any of the partitions, type and enter this command: dir <Parition Letter>WindowsImageBackup /s
  • The command you entered will display all the contents of the folder exceeding 10 GB in total size. You can check and confirm the integrity of the folder and if you find that the integrity is violated, then it is the reason why you’re getting the error.
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