How to Fix “Error Code 0xc1900101” Problem on Windows 11 Setup Assistant

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This tutorial is for solving “Error code 0xc1900101” problem on Windows 11 installation wizard. We will do our best to make sure you understand this guide. I hope you will like this blog How to Fix “Error Code 0xc1900101” Problem on Windows 11 Setup Assistant. If your answer is yes, please share after reading this.

Check how to fix “Error code 0xc1900101” problem on Windows 11 setup wizard

When we try to install Windows 11 we get error code like 0xC1900101 which is blocking the process by a certain percentage. The problem exists in most cases, whether you are installing through the Media Creation Tool, the installation wizard, or an ISO file, or updating Windows.

This error code always has a prefix like 0xc1900101 0x30018, 0xc1900101 0x20017, 0xc1900101 – 0x40021, 0xc1900101 – 0x3001a, 0xc1900101 0x2000c, 0xC1900101 – 0x4000D. 0xC1900101 The Windows 11 installation error is largely due to insufficient disk space, BIOS and SATA related issues, and the presence of third-party software. Besides, damaged system components, multiple SSDs, faulty network adapters can also have such problems.

As it seems, updating is very essential for all computer systems. System updates help protect your computer by installing security patches and increase overall performance with the help of quality of life updates. On top of that, installing a new Windows operating system is always an exciting thing. However, when this process is prevented by an error message, it can become a test.

Uninstall third-party antivirus

It turns out that the first thing to do when you encounter the problem in question is to uninstall the third party antivirus program on your system. While security programs are really beneficial because they protect you from potential malware and everything else, there are usually cases where they cause certain problems due to a false positive. This is quite common and happens to almost anyone who uses a third party security program.

For this reason, we recommend that you stick with Windows Defender by default, which has done quite well over the years and receives frequent updates. If you are using a third-party antivirus, uninstall it from your computer through the control panel. You can also choose to temporarily disable it if you really don’t want to delete it. Once you’ve done that, go ahead and see if the problem persists.

Remove BitLocker or other encryption

As we mentioned earlier, another reason that error code 0xc1900101 can cause is when you are using BitLocker or any other similar software to encrypt your drives. When this happens, the installation will not be able to continue because you will not be able to update the system files on the drive.

If this case applies, you will simply need to remove BitLocker protection from your computer to resolve the issue. To turn off BitLocker, follow the instructions below:

  1. First, open the Control Panel by searching for it in the Start menu.
  2. Then, in the Control Panel window, go to System and Security.
  3. After that, on the System and Security screen, click on the Manage BitLocker option under BitLocker Drive Encryption.
  4. Click the Disable BitLocker option provided to disable it.
  5. Once you have done that, go ahead and try updating / updating your system to see if the problem persists.

Disable RealTek Drivers

It turns out that if you are using Realtek drivers on your computer, it can sometimes cause the issue in question as well. Realtek drivers are primarily intended for your network and other connectivity such as Bluetooth.

If this applies, you will simply need to disable the RealTek drivers on your computer to resolve the issue in question. This can be done quite easily through the Device Manager window. Follow the instructions below to do this:

  1. First, open Device Manager by searching for it in the Start menu.
  2. In the Device Manager window, expand the Network adapters list.
  3. Find the RealTek drivers and right click on it. From the drop-down menu, choose Disable Device.
  4. Once you’ve done that, expand the Bluetooth list as well.
  5. See if there are Realtek drivers as well. Do the same for them too.
  6. After that, run the installation wizard to see if the problem persists.

Uninstall the .NET feature

Another way to resolve the issue in question is to uninstall the .NET feature on your computer. It is enabled by default in most editions of Windows and can be found in the Windows Features window.

If the issue is caused by the .NET feature, uninstalling it through the Windows Features window will most likely resolve the issue. Don’t worry, you can just reinstall them after updating using the same process. Follow the instructions below to do this:

  1. First, open the start menu and find the Control Panel. Open it up.
  2. Then, in the Control Panel window, go to Programs.
  3. On the Programs screen, click the Turn Windows features on or off under Programs and Features.
  4. The Windows Features window should appear.
  5. In the list at the top, uncheck the .NET Framework 3.5 (includes .NET 2.0 and 3.0) option. Then click on OK.
  6. Once you’ve done that, go ahead and restart your computer.
  7. After your PC starts up, try running the setup wizard to see if the problem persists.

Change the type of Secure Boot operating system

It turns out that Secure Boot is a feature required by the Windows 11 operating system. For this purpose, you need to enable Secure Boot. However, in some cases, you may experience an issue with your system updates when the operating system type is set to Other Operating System in the BIOS Secure Boot setup.

If this case is applicable, you will simply need to boot into your BIOS and then correct this problem. The procedure may vary slightly for everyone depending on which motherboard you have, so we cannot provide hard guidelines. However, the Operating System Type option can be found in the Safe Boot option of your BIOS setup, so keep that in mind. So go ahead, restart your computer and boot into your BIOS. Look for Safe Boot and in Safe Boot options change OS type from other OS to Windows UEFI mode. Once you have done that, save the changes and restart your computer. After that, run the installation wizard again to see if the issue is resolved.

Update BIOS

If changing the OS type in Secure Boot, the options did not solve the problem for you, the problem is most likely caused by outdated BIOS firmware on your end. This is probably due to the fact that Windows 11 is a demanding operating system due to its installation requirements which we are all familiar with at the moment. Therefore, if your BIOS firmware is not up to date, it may cause issues with the update process.

In such scenario, to fix the problem, you will simply need to update your BIOS firmware to the latest version available for your motherboard. To do this, you will need to go to your motherboard manufacturer’s website and search for your motherboard drivers. In most cases, there are utilities available from the manufacturer that you can use to install the latest BIOS firmware. Once done, you can try to run the installation wizard again to see if the error code 0xc1900101 reappears or not.

Clean install of Windows 11

Finally, if none of the above methods fixed the issue and you are still encountering the above mentioned error code, we are afraid that we may not have any solutions for you. In this case, you will have to perform a clean install of Windows 11 if you want to go wrong with the new operating system. A clean install means that you may lose all the data that is on the system drive and therefore you will also need to reinstall all the installed software on the system drive. To perform a clean install, you can follow our step-by-step guide that walks you through the process.

Final Words: How to Fix “Error Code 0xc1900101” Problem on Windows 11 Setup Assistant

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