How to Fix ‘Error code 0xc1900101’ Issue on Windows 11 Installation Assistant

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This tip is about the how to Fix ‘Error code 0xc1900101’ Issue on Windows 11 Installation Assistant. So read this free guide, How to Fix ‘Error code 0xc1900101’ Issue on Windows 11 Installation Assistant step by step. If you have query related to same article you may contact us.

How to Fix ‘Error code 0xc1900101’ Issue on Windows 11 Installation Assistant – Guide

When we try to install Windows 11, we get some error codes like 0xC1900101 which blocks the process by a certain percentage. The problem exists in almost every case, whether you are installing via the media creation tool, the Installation Wizard or the ISO file, or upgrading Windows.

This error code always has a prefix such as 0xc1900101 0x30018, 0xc1900101 0x20017, 0xc1900101 – 0x40021, 0xc1900101 – 0x3001a, 0xc1900101 0x2000c, 0xC1900101 – 0x4000D. 0xC1900101 Windows 11 installation error is widely invoked due to low disk space and issues associated with BIOS and SATA and the presence of third-party software. Additionally, corrupted system components, multiple SSDs, and faulty network adapters can also have these issues.

It seems that updating is very essential for all computer systems. System updates help keep your computer safe by installing security patches and increase overall performance with the help of quality of life updates. Also, installing a new Windows operating system is always an exciting thing to do. However, when this process is impeded by an error message, it can become an ordeal.

Uninstall third-party antivirus

It turns out that the first thing you should do when you encounter the problem at hand is to go ahead and uninstall the third-party antivirus program on your system. While security programs are really beneficial in keeping you safe from potential malware and whatnot, there are often cases where they cause certain problems due to a false positive. This is very common and almost happens to anyone who uses a third-party security program.

That’s why we recommend keeping the default Windows Defender, which has become very good over the years and receives updates frequently. If you are using a third-party antivirus, go ahead and uninstall it from your computer via Control Panel. You can also choose to disable it temporarily if you really don’t want to remove it. After doing this, go ahead and see if the problem still occurs.

Remove BitLocker or any other encryption

As we mentioned earlier, another reason you can get error code 0xc1900101 is when you are using BitLocker or any similar software to encrypt your drives. When this happens, the installation cannot proceed as it will not be possible to update the system files on the drive.

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

1. First, open up Control Panel by searching 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 the Manage BitLocker option under BitLocker Drive Encryption.
4. Click on the Disable BitLocker option provided to disable it.
5. After doing that, go ahead and try to update/update your system to see if the problem still appears.

Disable RealTek Drivers

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

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

1. First, open up Device Manager by searching the Start Menu.
2. In the Device Manager window, expand the list of network adapters.
3. Look for any RealTek drivers and right click on them. From the drop-down menu, choose Disable Device.
4. After doing this, expand the Bluetooth list as well.
5. See if there are Realtek drivers too. Do the same for them too.
6. After doing this, run the installation wizard to see if the problem still persists.

Uninstall .NET Feature

Another way to solve the problem at hand is to uninstall .NET feature in your computer. This is enabled by default in most editions of Windows and is located in Windows Features window.

If the problem is caused by .NET feature, uninstalling it through Windows Features window will certainly solve the problem. Don’t worry, you can simply install them again after upgrading through the same process. Follow the instructions below to do this:

1. First, open up Start Menu and look for Control Panel. Open it up.
2. Then in the Control Panel window, go to Programs.
3. On the Programs screen, click on the Turn Windows button features option on or off provided in Programs and Features.
4. The Windows Features the window should come up.
5. In the list at the top, uncheck the .NET Framework 3.5 (includes .NET 2.0 and 3.0) option. Then click OK.
6. After doing this, restart your computer.
7. After your PC boots up, try running the installation wizard to see if the problem is still appearing.

Change the safe boot operating system type

It turns out that Secure Boot is a feature which is required by the Windows 11 operating system. To do this, you will need to have secure boot enabled. However, in some cases, you may have a problem with updates to your system when you have the OS type set to Other OS in the Safe Boot BIOS Settings.

If this case applies, you will simply have to boot into your BIOS and then fix the problem. The procedure may vary slightly for everyone depending on the motherboard you have, so we cannot provide fixed guidelines. However, the OS Type option is within the Safe Boot option in the BIOS settings, so keep this in mind. So, restart your computer and boot into the BIOS. Find safe boot and in the safe boot options change the operating system type from another operating system to Windows UEFI mode. After doing this, save your changes and restart your computer. After that, run the installation wizard again to see if the problem has been fixed.

update BIOS

In case you change the OS type on safe boot, the options didn’t solve the problem for you, it’s very likely that the problem is being caused by outdated BIOS firmware on your edge. This is probably due to the fact that Windows 11 is a demanding operating system due to the installation requirements that we all know at the moment. So if the BIOS firmware is not up so far, this may cause problems with the update process.

In this scenario, to resolve the issue, you will simply have to update the BIOS firmware to the latest version available for your motherboard. To do this, you’ll have to go to the motherboard manufacturer’s website and look for the card’s drivers. In most cases, there are manufacturer-supplied utilities available that you can use to install the latest BIOS firmware. After doing that, you can try running the installation wizard again to see if error code 0xc1900101 appears again or not.

Clean installation of Windows 11

Finally, if none of the above methods fixed the problem for you and you are still encountering the above mentioned error code, we have no more workarounds for you. In that case, you will have to perform a clean install of Windows 11 if you don’t want to use the new operating system. A clean install means that you will lose all data that is on the system drive, and therefore you will also have to reinstall any software that was installed on the system drive. To perform a clean install, you can follow our detailed guide that will guide you through the process.

Final note

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