How to fix Unknown Hard Error on Windows 10

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If you see the warning dialog box with Unknown Hard Error suddenly appear and then the Windows 10 screen turns black, please read the following article to know how to fix it.

Error Unknown Hard Error is one of the most common system errors, which usually occurs in the Windows 10 operating system. You may experience this error while playing a game, running an application, or performing other tasks on a Windows computer. .

File system corruption, Windows registry corruption due to software changes, hard disk or hardware problems, etc… are some of the causes of Unknown Hard Error in Windows 10.

When this error occurs, you can not access the computer because it freezes the taskbar and turns the screen to black. Some users also report that they experience blue screen of death due to Unknown Hard Error.

Method 1: Perform a clean boot

The first method you need to take to resolve the Unknown Hard Error is to perform a clean boot. When you perform a clean boot, you will know the cause of the problem and find the right solution. To perform a clean boot, refer to the following article How to perform Clean Boot on Windows 10/8/7.

Method 2: Run the System File Checker tool

To check for corrupted system files, there is no more useful and useful tool than System File Checker. It will perform a system scan, then repair and restore corrupted files. Refer to the article Using the SFC command to fix Windows 10 system files.

Method 3: Run the Check Disk tool

If the failed drive is causing the Unknown Hard Error or blue screen error, you can run the CHKDSK command to check for hard drive failure.

Step 1. Run Command Prompt with administrative rights by right-clicking on the Start button and selecting Command Prompt (Admin).

Step 2. Type chkdsk /f /r into Command Prompt and press Enter.

Now the Check Disk utility will scan your hard drive and then automatically fix the errors it finds.

Method 4: Uninstall the Windows update

The installation of new Windows updates usually fixes the vulnerabilities, but some updates sometimes make things worse. If you encounter an Unknown Hard Error after installing a new Windows update, you can try uninstalling it.

Follow the steps below to uninstall the update on your Windows 10 machine:

Step 1. Press Windows + I to open Windows Settings.

Step 2. Select Update & Security> Windows Update and then click View update history to view the update settings on the computer.

Step 3. Now, on the View update history window, click on the Uninstall Updates option.

Step 4. From the Installed Updates window, right-click on the most recently installed update and select Uninstall.

After uninstalling the Windows update, restart the computer. This method has helped many Windows users to overcome the error sihost.exe or explorer.exe unknown hard error on Windows 10.