Assigning Multiple IP Addresses to Adapter

MSI.chm error is a common Windows Error code that occurs when the Windows OS becomes overloaded with invalid system references.

Solution

Error Causes

The MSI.chm error is normally triggered by the following causes:

• Poor PC maintenance

You may experience the MSI.chm error if you don’t pay attention to its maintenance. This usually happens when you don’t run antivirus software or update programs and drivers frequently.

• Registry files get corrupt and damaged

This error may also occur when the registry files of your PC get corrupt and damaged. This normally happens due to continuous writing, editing and deleting of information from your PCs registry over time as programs are installed, modified and deleted. Other causes include: malware and system conflicts.

Further Information and Manual Repair

When you come across the MSI.chm error on your PC, it is advisable to repair it immediately without any delays. If you procrastinate in repairing this error, your PC is likely to be exposed to risks like:

• Slow PC performance
• System failure and crashes

Nonetheless, to resolve this error you don’t have to get the assistance of an IT professional. The MSI.chm is easy to repair and you can resolve it in no time even if you aren’t technically adept. Here are some of the best ways to repair the MSI.chm error on your PC successfully in the shortest time:-

Cause: Corrupt and Damaged Registry Files

Quick Fix: If you think the MSI.chm Windows error on your system is related to Windows registry issues, then the best way to resolve this error is to download and install a Registry cleaner tool.  A word of advice here is to always download such tools from a reliable and a trusted website. Once you download the Restoro, run it on your PC to scan for errors. The scanning will usually take a couple of minutes. So, it is advisable to be patient. After the scanning is complete, you will see a detailed scanning report highlighting the registry errors on your PC. Now to resolve the MSI.chm error that has occurred on your PC due to registry issues, click on the ‘Repair’ button to fix the error. Once the repairing process is complete, restart your PC. Restoro helps you not only fix the MSI.chm error but it also helps improve the speed of your PC, and protects it from failure and crashes.

Cause: Poor PC Maintenance

Quick Fix: If the cause of the MSI.chm error is poor PC maintenance, then the best way to resolve the error is to update the drivers. You can do this by installing the latest drivers for the devices that you think are now old and need to be updated. Here’s what you need to do: First find which devices don’t have drivers installed. For this go to the start menu and then click on the Control Panel. Now open the Device Manager. The Device Manager will list down all the devices that don’t have drivers installed with yellow exclamation point icons next to the device name. As for the updates, the general rule of thumb if the driver does not support the program you are trying to run, then this means that you probably need to update the driver to ensure compatibility. For example your video card driver does not support a newly launched game, then you definitely need a driver update to play the game on your PC. To install or update drivers on your PC, you can either get CDs from the market or you can download updated versions of the drivers from the main manufacturer’s website for free. You can also use automated solution for all of your driver issues: So, next time when you or your friends encounter this problem, try these quick fixes to repair the error without any hassle.

Rundll Error - What is it?

Rundll Error, DLL is also known as Dynamic Link Library is a Window library that basically consists of instructions and codes used and shared by multiple programs installed on your system. It helps programs load and run smoothly. Rundll error is generated when the system fails to access DLL files thereby hampering your ability to successfully run your desired program.

Solution

Error Causes

The rundll error code is triggered due to multiple reasons such as:

• DLL file affected by virus and malware
• Poor program installation
• Invalid Windows registry entries

It is advisable to fix the run.dll error immediately without any delay because this error exposes your PC to serious threats such as system crash, freeze, failure, data loss, and even privacy threats like cybercrime, data breaches, and identity thefts.

Further Information and Manual Repair

To resolve the rundll error on your system, here are some solutions that you can try:

Solution 1: Reboot your System

Sometimes rebooting your system can also resolve the issue. However, if it doesn’t then you need to try some other solution to fix it.

Solution 2: Identify the Program Triggering the Error

To fix rundll error, the first thing that you need to do is to identify the program generating this error and check it for validity. For this, simply analyze the rundll error dialog box. Let’s say you get the following run.dll error on your system Error loading

C:\WINDOWS\system32\usvdgpo.dll.

This error message indicates that the program ‘usvdgpo’ is causing the run.dll error on the system. Once the program is identified, the next step is to stop it manually. For this, you go to the start menu and click run, now type ‘services.msc’ in the dialog box, and press ‘Enter’. After that right-click the related process to your rundll error and then click the ‘Stop’ button to stop the program. Now close the window. Though this action will stop the process it will not remove the reference to the bogus items. To remove that you will have to remove the program from the Windows Registry. This can be done by typing ‘Regedit’ in the Run dialog box. This will open the registry editor. From the keys listed in the left panel, navigate to the following key: HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Run. Now right-click on this key and click delete and then simply close the windows registry and reboot your system. After this, you will then have to uninstall the program to completely eradicate the rundll error. To do this, go to the control panel, Add/remove programs, and right-click to uninstall the program causing the run.dll error on your system. Click yes to confirm your decision. Once the program is uninstalled, reinstall the program using the program CD to get yourself an error-free program. This procedure is tricky, time-consuming, and maybe slightly challenging for you especially if you are not a computer programmer.

Solution 3: Run an Antivirus

If the cause of the run.dll error is a malware attack then you need to download an antivirus and run it on your system. However, this may impact the speed of your PC. Antivirus is notorious for slowing down PC speed.

Solution 4: Download Restoro.

If you are not a computer programmer, then running Restoro is possibly the easiest way for you to resolve rundll errors on your system in seconds. Restoro is an innovative, cutting edge, and multi-functional feature-filled PC repair tool that can be used to repair all kinds of system-related errors including rundll errors. The registry cleaner utility cleans up the RAM by removing unnecessary and obsolete files like junk files, invalid registry entries, and files from the uninstalled programs. It resolves disk fragmentation issues, repairs dll files, and the registry. In just a few clicks you can easily repair the registry and remove malware thereby resolving rundll errors on your system. Operating Total System Care is quite simple. It has a user-friendly interface and easy navigation. It is safe, efficient, bug-free, and compatible with all Windows versions Click here to download Restoro and resolve ‘rundll errors’ and access/run programs on your system smoothly.

If you are not able to access the Windows 10 Advanced troubleshooting options within Windows then you’ve come to the right place as this post will guide you on how you can repair or boot the Windows 10 installation without losing data using the bootable installation USB or DVD media. To repair or boot Windows 10 using the installation media, you have to download the Windows ISO, create a bootable USB or DVD drive, boot from the media and select “Repair your computer” and then select Startup Repair under Advanced troubleshooting. To get started, follow the given steps below carefully. Step 1: Frist, download the Windows ISO. Although this is not necessarily needed, it’s still better if you download the Windows ISO first so make sure that you download the same ISO version as installed on your computer. Step 2: Next, create a bootable USB or DVD drive.

• Insert your USB drive into your PC.
• Tap the Win + R keys to open the Run dialog box and type in “cmd” and tap Enter to open the Command Prompt. Alternatively, you can also search for “cmd” in the Cortana search box to open Command Prompt.
• Once you’ve opened CMD, type in this command to open the DISPART utility – diskpart
• After that, you should see a new black and white window that would say, “DISKPART>”.
• Next, type in “list disk” in the command line and tap Enter to see the list of all the Storage devices as well as your hard disk connected to your PC. Here, you have to identify your disk’s number.
• Type in this command where “X” is the disk number you have identified and then tap Enter – disk X
• Type in this command and hit Enter to clear the table records and all the visible data on the drive – clean
• Now you have to recreate a new primary partition of the drive so you’ll have to type in this command and tap Enter right after – create part pri
• A new primary partition has been created so you have to select it by typing this command and tapping Enter – select part 1
• Now you have to format it to make it visible to normal users by typing – format fs=ntfs quick

Note: If your platform supports the Unified Extensible Firmware Interface or UEFI, replace the “NTFS” with “FAT32” in the command on Step 10.

• After that, type in this command and tap Enter after – active
• Finally, type this command and hit Enter to exit the utility – exit
• After you prepare the image for the operating system, save it to the root of your USB Storage device.

Step 3: After creating a bootable drive, boot from the media and select the “Repair your computer” option. Once you boot from the USB drive, it will start the Windows 10 installation right away. So you must not keep on clicking Next as you will end up installing Windows. You need to look for the “Repair your computer” link on the first installation screen and click on it and then boot your computer into Advanced Recovery. Step 4: Select Startup Repair under the Advanced options screen

• Once you’re at the Advanced Recovery screen, select Advanced Options and select Troubleshoot.
• After that, look for the Startup Repair and click on it and then follow the next on-screen instructions. This solution will help you fix issues that do not allow you to boot into your computer.
• On the next screen, you will see the admin account with its name. Click on it and verify using the account password associated with the email.
• After verification, it will start to diagnose your computer and automatically resolve any detected issues related to boot.
• After the issue is fixed, your computer should reboot normally and you should now be able to use it. Note that your personal files are still intact since the process didn’t delete or wipe them out.

Keeping your system updated is a must and Windows updates are definitely a great way to do that. These updates are essential since they provide important security and various fixes for bugs in your Windows 10 computer. However, there are plenty of instances when you encounter issues with Windows Updates and one of them is when the Windows Updates turn off automatically at random times. Some users reported that they saw a notification about Windows Updates being turned off. Note that the issue is not with the update itself since many users turned on the Windows Update and the system was properly updated. The issue is that the Windows Updates turned off all by itself. There could be several reasons why the Windows Updates turned off by themselves. It could be due to the antivirus program installed on your computer. Antivirus programs are known to cause issues with other programs, Windows updates components included. This can occur due to false positives as well as odd compatibility issues. Aside from antivirus programs, the Windows Update service itself could also be the root cause of the problem. There could be a corrupted file in the Windows Update folder or it could be that the Windows Update service wasn’t started properly. Any of these issues can be resolved by following the troubleshooting options given below. Make sure to follow each one of them carefully for better results.

Option 1 – Try to disable your antivirus program

Disabling the antivirus program or any security software installed in your computer is always a good idea you can try when the Windows Update process does not go smoothly. So before you try updating your computer again, make sure to disable the antivirus or security program and once the Windows Update is done, don’t forget to enable the antivirus program back again.

Option 2 – Try to make some changes in the Registry

• Tap the Wins key once and type in “command prompt” in the field.
• From the search results, right-click on Command Prompt and select the “Run as administrator” option to run it with admin privileges.
• Next, type the following command and tap Enter:

reg add "HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionWindowsUpdateAuto Update" /v AUOptions /t REG_DWORD /d 0 /f

• After that, type the following command and hit Enter again:

sc config wuauserv start= auto

 The command you entered will set the Windows Update to auto so you should be good to go.

Option 3 – Try to reset the Windows Update components

If by any chance that the second option didn’t work, resetting the Windows Update components could also help you resolve the problem. How? Refer to the following steps:

• Open Command Prompt with admin privileges.
• After that, type each one of the following commands and hit Enter after you key in one after the other.
  • net stop wuauserv
  • net stop cryptsvc
  • net stop bits
  • net stop msiserver

Note: The commands you entered will stop the Windows Update components such as Windows Update service, Cryptographic services, BITS, and MSI Installer.

• After disabling WU components, you need to rename both the SoftwareDistribution and Catroot2 folders. To do that, type each one of the following commands below, and don’t forget to hit Enter after you type one command after the other.
  • ren C:WindowsSoftwareDistribution SoftwareDistribution.old
  • ren C:WindowsSystem32catroot2 Catroot2.old
• Next, restart the services you’ve stopped by entering another series of commands. Don’t forget to hit Enter after you key in one command after the other.
  • net start wuauserv
  • net start cryptsvc
  • net start bits
  • net start msiserver
• Close Command Prompt and reboot your PC.

Option 4 – Run the Windows Update Troubleshooter

Running the built-in Windows Update troubleshooter is one of the things you can first check out as it is known to automatically resolve any Windows Update errors. To run it, go to Settings and then select Troubleshoot from the options. From there, click on Windows Update and then click the “Run the troubleshooter” button. After that, follow the next on-screen instructions and you should be good to go.

As you know, the functioning of the Windows Sandbox feature is supported by various components in the background of the Windows operating system. And the only way for you to enable the Windows Sandbox feature in your computer is through the Turn Windows features on or off utility. This feature will work directly on the basis of Virtualization which is also supported by Hyper-V. However, there are some reports claiming that some computers have the Windows 10 Sandbox item greyed out in the Turn Windows features on or off utility. Thus, in this post, you will be guided on what you can do to resolve such a problem in your Windows 10 computer. In this kind of problem, you should know that this has something to do with the Second Level Address Translation which is one of the important pillars of how the Windows 10 Sandbox feature functions. Thus, if the Second Level Address Translation or SLAT feature in Windows Sandbox is not supported by the CPU of your computer, there is no way for you to use Windows Sandbox on your computer. On the other hand, if SLAT is supported, then there is definitely something you can do to resolve the greyed-out Sandbox item in Windows 10.

To get started, follow the steps provided below.

Step 1: First, you have to boot into the BIOS of your PC. Step 2: After that, make sure that the following options are set to their respective configurations:

• Hyper-V – Enabled
• VM Monitor Mode – Yes
• Virtualization – Enabled
• Second Level Address Translation (VT-d or RVI) – Enabled
• Data Execution Prevention – Enabled

Step 3: Once you’re done, save the configuration and then restart your Windows 10 computer as usual. Step 4: Once your computer has restarted, you should see the same option in the Turn Windows features on or off utility and it should no longer be greyed out. Then you can now enable the feature and follow the onscreen instructions need to use the feature as best as you can.

If your Windows 10 computer is downloading or installing updates but suddenly an error pops up saying, “GWXUX has stopped working”, read on as this post will show you what you can do to resolve the problem. GWXUX is a process responsible for downloading and installing Windows updates and is installed on your computer via Windows Updates. That particular update is known as “KB3035583”. Through this process, the “Get Windows 10” pop-ups are installed and initiated by Microsoft. This process is also capable of checking the compatibility of your PC to run Windows 10 as well as preparing it for installation. However, this process might also result in excessive usage of Disk and sometimes, CPU. So in this post, you will be guided on how you can fix the issue with the GWXUX. Follow the instructions given below carefully.

Option 1 – Disable GWXUX in the Task Scheduler

You will have to disable the gwxux.exe process to run from the Task Scheduler. Thus, you need to follow the steps below to do so.

• Open the Cortana Search box and then type “task scheduler” in the field.
• Then click on Task Scheduler from the related search results that appear to open it.
• After opening the Task Scheduler, navigate to Microsoft > Windows > Setup > gwx on the left panel from the Task Scheduler Library.
• Once you select the GWX folder, you will see two tasks that are listed under that folder. Select both of these tasks and permanently disable them.
• Restart your computer to apply the changes made and check if the issue is now fixed or not.

Option 2 – Uninstall the KB3035583 Windows Update

• To uninstall the KB3035583 Windows Update, you need to go to Control Panel, and for you to do that, type “control panel” in the Cortana Search box.
• After that, click on Control Panel from the related search results given.
• Once Control Panel is pulled up, search for “View Installed Updates” in the search field from the top right part of the window.
• Next, click on a link labeled, “View Installed Updates” under the Programs and Features menu.
• After clicking the link, you will see the list of all the installed updates in your computer from the Windows Updates.
• Now look for an update named “KB3035583” and select it.
• You should notice the Uninstall button located at the top portion of the sub-menu ribbon as you can see on the snippet below. Click on that button to uninstall the KB3035583 Windows Update.
• After uninstalling the update, make sure to restart your computer to apply the changes made.

Option 3 – Try using the System File Checker

System File Checker or SFC is a built-in command utility that helps in restoring corrupted files as well as missing files. It replaces bad and corrupted system files with good system files that might be causing the error 0x80200056. To run the SFC command, follow the steps given below.

• Tap Win + R to launch Run.
• Type in cmd in the field and tap Enter.
• After opening Command Prompt, type in sfc /scannow

The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:

1. Windows Resource Protection did not find any integrity violations.
2. Windows Resource Protection found corrupt files and successfully repaired them.
3. Windows Resource Protection found corrupt files but was unable to fix some of them.

After running the System File Checker, restart your computer and check if the error with the GWXUX.exe file is now fixed or not.

What is Error 0x8024a11a or 0x8024a112 ? If you are trying to update your Windows 10 computer and just when you were done downloading the feature update and about to install it, you encounter an error message saying:

“We’re having trouble restarting to finish the install, Error 0x8024a11a, 0x8024a112, 0x80070005 or 0x80070032”

And so to fix this problem, this post will give you a couple of possible solutions. Refer to the options given below to get started.

Option 1 – Restart your computer many times

This is the first thing you can try since there are instances when the Windows Update process gets stuck for a minor thing and restarting the computer usually helps in resolving the issue. All you have to do is click the Restart now button. However, if it does not work, you can use the Power buttons from the Start Menu or WinX Menu. Aside from that, you can also use your power buttons such as Alt + Ctrl + Del to restart your computer. And during the boot process, it is recommended that you restart your computer in Safe Mode or even in a Clean Boot State. After that, you can restart your computer in normal mode. This will make sure that no third-party processes will be able to interfere with the Windows Update process. To put your PC in a Clean Boot State, here’s what you have to do:

• Log onto your PC as an administrator.
• Type in MSConfig in the Start Search to open the System Configuration utility.
• From there, go to the General tab and click “Selective startup”.
• Clear the “Load Startup items” check box and make sure that the “Load System Services” and “Use Original boot configuration” options are checked.
• Next, click the Services tab and select the “Hide All Microsoft Services” check box.
• Click Disable all.
• Click on Apply/OK and restart your PC. (This will put your PC into a Clean Boot State. And configure Windows to use the usual startup, just simply undo the changes.)
• After that, try to install the Windows Updates or upgrade again.

Option 2 – Try running the Windows Module Installer

The Windows Module Installer is a built-in service in the Windows operating system that could help you resolve the Windows update error 0x8024a11a or 0x8024a112. You need to make sure that this service is Started and that its Startup type is set to Automatic – you can do this via Services Manager or by executing the command given below in an elevated Command Prompt.

• Tap the Win + R keys to open the Run dialog box.
• Then type “command prompt” in the field and hit Enter to open Command Prompt.
• And in the elevated Command Prompt type in the following command and hit Enter:

SC config trustedinstaller start=auto

• After executing the command successfully, you should see the “[SC] ChangeServiceConfig SUCCESS” message on the Command Prompt window.

Option 3 – Run the DISM tool

You can also run the DISM Tool as it helps in repairing the Windows System Image as well as the Windows Component Store in Windows 10. Using this built-in tool, you have various options such as the “/ScanHealth”, “/CheckHealth”, and “/RestoreHealth” which could help in fixing the Windows update error 0x8024a11a or 0x8024a112.

• 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 4 – Run the System File Checker

System File Checker or SFC is a built-in command utility that helps in restoring corrupted files as well as missing files. It replaces bad and corrupted system files to good system files that might be the cause why you’re getting the errors 0x8024a11a and 0x8024a112. To run the SFC command, follow the steps given below.

• Tap Win + R to launch Run.
• Type in cmd in the field and tap Enter.
• After opening Command Prompt, type in sfc /scannow

The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:

1. Windows Resource Protection did not find any integrity violations.
2. Windows Resource Protection found corrupt files and successfully repaired them.
3. Windows Resource Protection found corrupt files but was unable to fix some of them.

Option 5 – Run the Windows Update Troubleshooter

Running the built-in Windows Update troubleshooter could also help you resolve the Windows update error 0xca00a000. To run it, go to Settings and then select Troubleshoot from the options. From there, click on Windows Update and then click the “Run the troubleshooter” button. After that, follow the next on-screen instructions and you should be good to go.

Option 6 – Run Microsoft’s online troubleshooter

Running Microsoft’s online troubleshooter might also help you fix the Windows update error 0x8024a11a or 0x8024a112. This online troubleshooter is known to help in fixing Windows Update errors, it scans your computer for issues that might be causing the problem and then fixes them automatically.

When you get an igfxem.exe error in Windows, it is not really clear what does this means, usually, Windows throw us some code or we get a DLL error, rarely we get an EXE error. So what does this error means? Intel Graphics Executable Main Module, shortly called as IgfxEM module is a part of the Windows operating system. When you run Microsoft .NET Framework applications that use the AS/400 Data Queue ActiveX control (Mseigdq.dll) to read from and to write to IBM iSeries (AS/400) data queues, you may experience this error. In order to overcome this error and cope with it try the following things:

1. Increase Virtual Memory

   Go to the Start Menu and click on Settings. Type performance. Choose Adjust the appearance and performance of Windows. In the new window, go to the Advanced tab and under the Virtual memory section, click on Change. At the bottom of the new window, check what the Recommended value is and how it compares to Currently allocated. If the current setting is significantly less than the recommended, uncheck the Automatically manage paging file size for all drives box at the top of the same windows and then click on Custom size. Enter the Recommended value in the Initial Size box, and a larger figure in the Maximum size box. Click OK to save the new settings.

2. Download and update .NET framework

   Go to the Microsoft website and download the latest .NET framework. Once the download is complete, install the package following onscreen instructions.

3. Reinstall INTEL graphic drivers

   Go to the intel website and download the latest graphic drivers for your graphic card model. Once the download is complete, install the package following onscreen instructions.

4. Run SCF scan

   If all else fails, run command prompt and inside type sfc /scannow

Instaling and removing applications from your Windows can sometimes leave some traces that are unpleasant and can cause annoyances. One of these annoyances is the program in the startup section of the task manager.

If you ever opened task manager and went into the startup section trying to disable some of the startup items on your Windows boot there might be a chance that you have experienced and seen a program without any icon or information about it just sitting there.

This is due to some applications being removed from the system but for some reason, it still shows itself in startup and it is quite annoying. So here we will show you how to get rid of this annoyance so your startup is clean again without junk in it.

Removing a program from startup

Locating the source of the issue

The first thing of course is to open the task manager itself and navigate to the startup tab. Inside the startup tab right-click on the column header and tick or enable Startup type and command line. Now you will see the location of the supposed file (that is missing or you could just go there by right-clicking on the item, but here it is greyed).

99% of the time startup type will be registry since the file is missing, if it was a file fix would be just to simply delete the file in the folder but since it was installed and not properly removed registry key is still present but the file cannot be found. After confirmation that the file is indeed missing and that the startup type is registry open the registry editor by typing Regedit in search and pressing enter.

Removing the key from registry

Inside Registry editor navigate to: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run. Inside on right part, you will see all auto-start entries added by installed applications.

Locate one that is causing issues by comparing its path with the path inside the task manager command line and delete the key. Once the key is deleted right-click on RUN on the left part and choose HKEY_LOCAL_MACHINE to quickly jump on that key location and repeat the process of key deletion if needed. HKEY_LOCAL_MACHINE will delete startup entry for all users and sometimes entry will not be present here since the application is not installed for all users or there are no other users on the machine.

After the procedure is finished, reboot your systems in order to apply changes.

The error code 0X8019019A is shown when a user fails to add his Yahoo account to the Mail app due to the outdated or corrupt installation of the Mail app. Not using an App-specific but a normal Yahoo account password may also result in the error at hand. In this guide, we will show you how to effectively fix this error so you can set up Yahoo mail.

1. Reboot PC

   Perform a restart of your system to rule out a temporary glitch in the system. Also, check if you can successfully access your email through a web browser using the same credentials as you are using with the Mail app. Additionally, make sure that no VPN or proxy server is being used to access the internet (VPN/proxy may work fine with the web version of Yahoo mail but may hinder the access through a mail client).

2. Update Windows and the Mail App to the Latest Build

   If your system is not updated to the latest build it can create incompatibility between the OS modules. Updating the Windows and Mail app of your system to the latest build may solve the problem.

3. Re-add the Yahoo Account to the Mail App

   The Yahoo account issue could be a result of a temporary glitch in the communication modules of the system. The glitch may get cleared if you remove and then re-add the Yahoo account to the Mail app.

4. Reset the Mail App to the Defaults

   You may fail to add the Yahoo account to the Mail app if the installation of Mail itself is corrupt. In this scenario, resetting the Mail app to the defaults may solve the problem.

5. Generate an App Password and Use it to Add the Yahoo Account to the Mail App

   Yahoo has implemented tons of security features to its accounts. One such feature is the use of app-specific passwords for less secure apps like the Mail app. If your Yahoo username or password is not working with the Mail app, then using the App-specific password may solve the problem.