![]() As you can see in the screenshot below, in this example, the System partition (100MB) is the volume 2.ġ3. Then type the following command and find out the volume number of the System partition by using its size as a reference. Now notice the size of the System partition (e.g. In Command prompt give the following commands in order (press enter after each command)ġ3. Click Advanced Options and go to Troubleshoot > Command Prompt.ġ1. If the Startup Repair cannot fix the problem, continue to next step.ġ0. If the Startup Repair can fix the problem, shutdown the virtual machine, set the hard disk as first boot device and try to start again the virtual machine.ī. Allow the Startup Repair to run and depending on the result do the following actions:Ī. Then select Troubleshoot > Startup Repair.ĩ. Start the Virtual Machine and click Next > Repair Your computer.Ĩ. … go to System and drag Optical to the top in order to boot the VM from the attached Windows.iso.Īlso, make sure that the " Enable EFI" option is unchecked, otherwise you will not be able to boot from the ISO file. After attaching the Windows.iso file in Storage devices…Ħ. Then select the Windows.iso file and click Choose.ĥ. Click Add and find and open the Windows.iso file.Ĥ. Click the 1st plus ( +) button next to Controller to add optical drive.ģ. Open the Settings of the VirtualBox machine and go to Storage.Ģ. * Note: If you don't own a Windows 10 ISO file, you can download one directly from Microsoft, by using the Media Creation Tool.ġ. The final method to solve VirtualBox error "FATAL: INT18: BOOT FAILURE" is to fix the boot problems on the Guest machine, by starting the guest machine from a bootable Windows 10 ISO file.* After reboot, start the VirtualBox VM machine and see if the problem is fixed. Type the following command and press Enter:ħ. * Note: The 'Containers' and the 'Hyper-V' features exists only in Windows 10 PRO.ĥ. Uncheck the following features and click OK to apply the change: Navigate to Control Panel > Programs and Features > Turn Windows features on or offĢ. Hopefully it will start without error now. Here ensure that the Hard Disk is checked and is the first boot device, and at Extended features check the following two (2) options and click OK:Ĥ. Open the VM Settings and go to System > Motherboard.ģ. Press the X button to close the VM machine window and Power Off the machine.Ģ. ![]() To fix this problem just proceed and enable UEFI on the VirtualBox machine's settings. The fatal error "INT18 BOOT FAILURE" in VirtualBox, commonly appears when you attaching a VHD/VHDX/VMDK file which contains an UEFI operating system. ![]() How to FIX: INT18 BOOT FAILURE & Windows 10 Error Code 0x0000225 in VirtualBox. This tutorial contains detailed instructions to troubleshoot the "INT18: BOOT FAILURE” error in VirtualBox. After converting the physical disk of a Windows 10//11 UEFI computer to a Virtual Hard disk (VHD or VHDX) and attaching the VHD/VHDX file to a new VirtualBox machine, the VM couldn't start with fatal error: INT18: BOOT FAILURE or the guest Windows 10 OS couldn't start with error code: 0x0000225. If you receive the VirtualBox error "FATAL: INT18: BOOT FAILURE" when starting a guest machine with Windows 10/11 OS, continue reading below to fix the problem.
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