Windows Update

Fix error 0x800705b4 in Windows Update and Windows Defender

In this guide, you can read the symptoms, causes, and some proven best practices for solving error code 0x800705b4. Plus, this page will teach you how to back up Windows to protect your system and files from getting damaged. This error code can occur for Windows Update and Windows Defender. With this error unresolved, the computer may slow down or even crash. If you are pestered by this error right now, don’t get frustrated as you can easily handle it.


Error 0x800705b4 that happens to a Windows computer can be quite common, and the same code can appear in different cases with different error messages. 0x800705b4 is a hexadecimal data format, and this is a common way used by Microsoft Windows to display errors. Computer users should not ignore such errors even if it doesn’t seem like a big deal. But the end result can be a delay or crash the computer or even loss of data if it is not fixed. This article provides step-by-step instructions to resolve this common error in Windows Update and Windows Defender. The following subtitles are quick links to rich content.

Windows Code error 0x800705b4


Windows Update (WU) is a service provided by Microsoft and its mission is to provide updates to the operating system and Microsoft products such as Microsoft Office, Windows Live Essentials, etc. is configured to automatically download and install Windows Updates if the computer is connected to the Internet and updates are available. Microsoft also allows its customers to install updates on computers without an Internet connection, as well as other alternatives and programs to install the update. Windows updates include several types of updates, such as security updates and critical updates that fix system vulnerabilities for malware or security vulnerabilities . Other updates with bug fixes or feature improvements.

Occasionally, Windows Update does not work properly and does not install updates. Nowadays, Windows update error 0x800705b4 is no longer a strange problem for many Windows users. This error code usually comes up with an error message, for example: “There was a problem installing the update, but we’ll try again later. If you keep searching and want to search the web or contact information support, this might be helpful: 0x800705b4) “.

Windows Update

What is the cause of the error?

  • The operating system cannot update itself
  • Windows system files are corrupted or with system corruption
  • Update service is not configured as automatic update
  • Registry error
  • Virus or malware attack


A lot of times, users ignore the error and continue using the discouraged computer. This Windows Update 0x800705b4 error can become a disaster for your computer. You are more likely to run into more computer problems if the error cannot be solved with an effective solution. For the purpose of information security and computer performance, you should stop the problem as soon as possible. This section gives some methods, please read on.

Method 1: Run an sfc scan for the system

In general, if you have no clue what to do to get rid of the Windows update error, it’s a smart option to run an sfc for your system. This is a free tool and it can fix many common system errors. SFC allows users to find corrupt Windows system files and repair them. As we all know, once the system files are damaged or lost, the computer will not be able to perform as before.

Step 1

Launch Command Prompt. Click “ Start ” and type “ cmd ” into the search box and you can see its icon. Right click on it and select Run as administrator.

If you are asked for an administrator password or confirmation from UAC, enter the password and click Allow .

Step 2

Now you can see a command prompt where you can type or copy the command “ sfc / scannow ” and press the Enter key.

The process of scanning all protected system files and repairing the corrupted files begins; don’t close Command Prompt before the process is done. If Windows Resource Protection does not find any integrity violation you will receive the following message:

  • Windows Resource Protection could not perform the requested operation.
  • Windows Resource Protection found corrupt files and successfully repaired them.
  • Windows Resource Protection found corrupt files but was unable to fix some of them.

Method 2: Perform a system restore

Performing a real system restore is an effective and wise choice to fix any problems with the current system condition. The system backup is usually completed when Windows is in the groove and free from the error. Note: back up important files in the system partition before restoring the system. Besides, if your system has never been backed up, skip this method.

The system can be backed up by professional programs as well as backup features provided by Windows. Most users prefer the first, as third-party system backup software like Eassos System Restore makes the job easier and more flexible. Eassos System Restore offers a 15-day free trial and you can download and follow its backup trick for system backup, and the end introduces how to back up Windows using Eassos System Restore. The following section shows how to restore the system using the utility built into Windows.

Step 1

Press the ” Start ” button and type ” system restore ” into the search box. Right-click System Restore in the list of results and choose Run as Administrator . This tool can also be found through the Control Panel.

system restore

Step 2

Select a time to restore the system. Here you can choose to suggest a specific recovery or recovery and you can choose based on actual situation.

Step 3

Review the restore point and click Finish.

Method 3: Update the system to the latest version

Even though the computer is set up to install updates automatically, sometimes it still fails for some reason, for example a bad network connection. In that case, reinstalling the update manually might resolve the 0x800705b4 issue.

Step 1

Click the ” Start ” button and select Control Panel . Select System and Security and click Windows Update .

Step 2

Click “ Check for updates ” on the left part of the window and update Windows to the latest system.

Method 4: For Windows 10 users

If you are using Windows 10 and are facing system update error code 0x800705b4, please try the following steps.

Step 1

Update Windows Defender from the security center. To locate Windows Defender, click the Start button -> Settings -> Update & security -> Windows Defender.

Step 2

Go to Windows Updates and click on “ Advanced options “. Click the option to receive updates for other Microsoft products.

Step 3

Restart your computer and check for updates again. The update will be done without problems. When you get the ” Your device is up to date ” message, click on ” Advanced options ” again and check the update options for Microsoft programs again.

Step 4

Check for updates again and now you should be able to download and install them. Then update other programs.

Other solutions are found on the net

If you continue to see this error after trying the methods above, your problem could be caused by other factors. The solution to this error may differ from user, so I listed other solutions found online and hope they can work for you.

1. Try Windows Update Troubleshooter. This tool is provided by Microsoft for free and you can download and run it to fix the problem in Windows update including Service Pack. It has on-screen instructions for users to follow and can automatically identify and fix the current issue once it’s launched.

2. Disable Windows Defender, firewall, or any third-party antivirus software and then try system update again.

3. Disconnect any unnecessary devices, such as webcam, printer, USB flash drive, unless there are updates available for these devices, then run Windows Update again.

Windows Defender error


Windows system provides users with a protection tool built-in Windows Defender, designed to provide real-time protection to the computer. This is one of the useful tools provided by Microsoft and most of the times it works effectively as described. This is free software to protect the system from external threats like spyware and malware and it is a good choice for third party software to protect the computer.

However, no software has the exception to be free from bugs or bugs. There are many cases where Windows Defender fails to boot or scans the system and gives different error messages. These messages usually appear with codes like 0x80070002 and 0x800705b4. 0x800705b4 is one of the most common errors and it causes Windows Defender to stop and give an error message: “Windows Defender could not turn on real-time protection. Returned to this activity because the timeout has expired. Click Help for more information on the problem Error Code: 0x800705b4 “.

Sửa lỗi 0x800705b4 trong Windows Update và Windows Defender

The reason behind the error

Your computer has installed some third-party protection software that is not compatible with Windows Defender. Conflict between the two tools leads to errors.

Registry is lost or corrupt, system drivers are outdated, or Windows has not been updated. There are cases where the computer is reporting 0x800705b4 because Windows settings were lost.

Windows infects the latest malware and software and the system will not be able to use the tool.


This error stops Windows Defender from working flawlessly and facilitates virus attack. Therefore, it must be fixed to ensure a system that ensures the environment. Several solutions can be used to get rid of the error due to reasons that vary from user to user. This section outlines the two most commonly recommended solutions.

Method 1: Disable third-party antivirus software

Step 1

Disable or remove third-party antivirus software. You can go to the software’s official website to find detailed instructions.

Step 2

Keep Firewall turned on. If you have both anti-virus software and a third-party firewall installed on your computer, you should make sure that Windows Firewall is enabled.

Click the Start button and type Windows firewall in the search box. Click Windows Firewall from the search results. Also you can find it from Control Panel:

Start -> Control Panel -> System and Security -> Windows Firewall

Next on the left sidebar of the window click Turn Windows Firewall on or off and click Turn on Windows Firewall on the next window.

Step 3

Start Windows Defender . Click the Start button and type Service in the search box and right-click on the Service from the search results to run it as administrator. In the Service window, search for Windows Defender and set it to Start.

Step 4

Restart the computer to make these settings take effect.

Method 2: Use Registry Editor

Step 1

Open Registry Editor . Press Windows key + R and type regedit and press Enter . If you are prompted by UAC for confirmation, click Yes .

Step 2

Locate Windows Defender in the following path: HKEY_LOCAL_MACHINE SOFTWARE Policies Microsoft Windows Defender

Step 3

You should see a file called DisableAntiSpyware in the right part of the window. Double click REG_DWORD and you can see the Value data as 1 on the pop-up box. Replace 1 with 0 and press OK . Alternatively, you can delete the HKEY_LOCAL_MACHINE SOFTWARE Policies Microsoft Windows Defender key

Step 4

Restart your computer and Windows Defender will return to normal working state.

Windows backup

For many computer users, nothing is worse than a damaged system and you have to reinstall it. In the process you spend a lot of time reinstalling the system and drivers for your hardware, downloading and reinstalling the programs you use often, reconfiguring system settings, downloading back up individual files… If you don’t want to go through the process, take a system backup.

It is always recommended to create a system image for your computer in case of system problems or crashes. The image file should include all the data of the system partition, such as Windows, system settings, installed programs and files. The system image is said to be stored in a location separate from the system partition, so it will not be affected when the system fails. Having a system backup image, you can restore the system when your system slows down or is unable to work smoothly. How do I backup windows?

Eassos System restore, easy-to-use system backup software, is designed to complete the system backup in just a few clicks. This program has a visual wizard for the backup and restore process, which can be used by both expert users and beginners.

Step 1

Install Easos System Restore and its boot options to your computer.

Step 2

Launch the backup software and click the Backup button from the main interface.

Easos System Restore phần mềm sao lưu

Step 3

Click the ” Next ” button to start the system backup. Before that you can click “ Options ” to configure advanced settings, such as where to store system images, how to compress image files, set passwords, etc. don’t know what to do with these options, you can follow the default settings.