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

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

When we were trying to install Windows 11, we received some error code such as 0xC1900101 which disrupted the process in part. The issue arises in most cases whether it is installed through the Media creation tool, Installation Assistance or ISO file, or by Windows synchronization.

This type of error code is always classified as 0xc1900101 0x30018, 0xc1900101 0x20017, 0xc1900101 – 0x40021, 0xc1900101 – 0x3001a, 0xc1900101 0x2000c, 0xC1900101 – 0x4000D. 0xC1900101 Windows 11 Error Install too much due to small disk space, and issues associated with BIOS & SATA, and the presence of third-party software. Besides, system corruption, multiple SSDs, network adapters may have similar problems too.

As it turns out, upgrading is very important for every computer system. System updates help keep computers secure by installing security patches and increase overall performance with the help of quality quality updates. On top of that, installing the latest Windows operating system is always an exciting thing to do. However, when this process is protected by an error message, it can turn into a hassle.

Remove Third-party Antivirus

As it turns out, the first thing you should do when you encounter the problem in question is to go ahead and remove the third-party antivirus program on your machine. While security programs are very useful as they provide protection from potential malware and what not, there are always cases where they cause some problems due to false positives. This is very common and almost happens to everyone who uses a third-party security system.

Because of this, we recommend sticking to the default Windows Defender which has improved over the years and receives regular updates. If you are using a third-party antivirus, go ahead and remove it from your computer by control panel. You can also choose to play it for a while if you do not really want to remove it. Once you have done that, go ahead and see if the problem occurs again.

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Remove BitLocker or Any Other Encryption

As previously mentioned, another possible cause of error code 0xc1900101 is when using BitLocker or any similar software to encrypt your drivers. When this happens, the installation will not be able to continue because it will not be able to update the system files in the computer.

If this is the case, you will have to easily remove BitLocker security from your computer to solve the problem. To remove BitLocker, follow the instructions given below:

  1. First, open up Control Panel by searching in Menu.
  2. Then, on the Control Panel window, go to Settings and Security.
  3. After that, on the Settings and Security screen, click the Manage BitLocker option under BitLocker Drive Encryption.
  4. Click the Off BitLocker option provided to activate.
  5. Once you have done that, go ahead and try to update / upgrade your system to see if the problem reappears.

Turn off RealTek Drivers

As it turns out, if you are using Realtek drivers on your computer, that may cause the problem in question sometimes too well. Realtek drivers are great for your network and other connectivity such as Bluetooth.

If this is necessary, you will have to remove the RealTek drivers from your computer to fix the problem in question. This can be done pretty easily through the Device Manager window. Follow the instructions given below to do this:

  1. First, open up the Device Manager by searching for it in the Start Menu.
  2. On the Device Manager window, expand the list of Network converters.
  3. Find any RealTek drivers and right-click on them. From the drop-down menu, select Activate Device.
  4. Once you have done that, expand the Bluetooth menu thoroughly.
  5. See if any Realtek drivers are fine. Do the same for them as well.
  6. After doing that, go ahead and run the installation assistant to see if the problem is still there.

Remove .NET Feature

Another way to solve this problem is by removing .NET feature on your computer. This is run by default on most Windows versions and is available in Windows Features window.

If the problem is caused by .NET feature, uninstalling it through windows Features window will of course solve the problem. Do not worry about how to install them again after the update by the same process. Follow the instructions below to do this:

  1. First, open up the Start Menu and search for the Control Panel. Open it up.
  2. Then, on the Control Panel window, make your way to Settings.
  3. On the Settings screen, click on Turn Windows features on or off option provided under Settings and Features.
  4. Windows Features window should be up.
  5. On the menu, at the top, open the .NET Framework 3.5 (including .NET 2.0 and 3.0) options. Then, click OK.
  6. Once you have done so, go ahead and restart your computer.
  7. After booting your PC up, try running an installation assistant to see if the problem reappears.
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This Secure Boot OS Type

As it turns out, Secure Boot is a feature required by Windows 11 operating system. For this purpose, you will need to have the boot security enabled. However, in some cases, you may experience an issue with upgrades on your device when you have the Type OS set to Other OS in the BIOS settings of Boot Secure.

If this case is valid, you will only need to boot into your BIOS and then fix this problem. The process may vary slightly for everyone depending on the motherboard you have so we cannot provide fixed instructions. However, there is an OS Type option in the Security Boot option in your BIOS settings and keep that. So, go ahead and restart your computer and boot into your BIOS. Find Boot Secure and inside the Boot Secure options, change the 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 assistant again to see if the problem persists.

Update the BIOS

If you change the OS type in Boot Secure, the options do not solve the problem for you, it is likely that the case is caused by the old BIOS firmware at its end. This is possible due to the fact that Windows 11 is a demanding operating system due to the installation requirements we all know at this point. Therefore, if your BIOS firmware is not up to date, it may cause problems with process upgrades.

In such a case, to solve the problem, you will have to easily update your BIOS firmware to the latest version available for your motherboard. To do this, you will have to go to the manufacturer’s website of your motherboard and find your configuration drivers. In most cases, there are applications provided by the manufacturer that you can use to install the latest BIOS firmware. Once you have done that, you can try running the installation assistant again to see if error code 0xc1900101 appears again or not.

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Install Windows 11 clean

Finally, if none of the above methods fix the problem for you and you are still encountering the error code mentioned above, then we fear that we do not have any additional functions for you. In such case, you will have to perform a clean installation of Windows 11 if you want to get on the latest operating system. Clearing it means that you have lost all your data on your operating system and therefore will still have to reinstall all the software you have installed in the system driver. To perform a clean installation, you can follow our information guide that takes you through the process.

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