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A "clean boot" starts Windows with a minimal set of drivers and startup programs, so that you can determine whether a background program is interfering with your game or program. This is similar to starting Windows in Safe Mode, but provides you more control over which services and programs run at startup to help you isolate the cause of a problem.
On the Startup tab of System Configuration, select OK. When you restart the computer, it will be in a clean boot environment. Follow troubleshooting steps to install, uninstall, or run your application. Your computer might temporarily lose some functionality while in a clean boot environment. Reset the computer to start normally after clean boot troubleshooting and resume functionality.
How to determine what is causing the issue by performing a clean boot
If the program still doesn't run as expected, this issue is not caused by application or service interference. You might need to contact the program manufacturer for more specific support.
If your problem does not occur while the computer is in a clean boot environment, then you can determine which startup application or service is causing the problem by systematically turning them on or off and restarting the computer. While turning on a single service or startup item and rebooting each time will eventually find the problematic service or application, the most efficient way to do this is to test half of them at a time, thus eliminating half of the items as the potential cause with each reboot of the computer. You can then repeat this process until you've isolated the problem. Here's how:
On the Startup tab of System Configuration, select OK. When you restart the computer, it's in a clean boot environment. Follow troubleshooting steps to install, uninstall, or run your application. Your computer might temporarily lose some functionality while in a clean boot environment. Reset the computer to start normally after clean boot troubleshooting and resume functionality.
The computer restarts in a clean boot environment. Follow troubleshooting steps to install, uninstall, or run your application. Your computer might temporarily lose some functionality while in a clean boot environment, however that functionality will return. Finish troubleshooting and reset the computer to start normally.
The steps described on this page assume you have Windows installation media and access to a Windows technician PC. If you're looking for an easy, automated way to create a bootable Windows installation flash drive, see:
A device running Windows 10 has several requirements for booting into the OS. After the device's firmware initializes all the hardware, the device needs to ensure that there's enough power to boot. Afterwards, the device needs to ensure that the device is booting into the appropriate OS depending on if the user wants to perform an update or a restore on the device, or if the user wants to boot the device into the main OS.
The firmware boot loaders boot the UEFI environment and hands over control to UEFI applications written by the SoC vendor, Microsoft, and OEMs. These applications can utilize UEFI drivers and services.
The SoC firmware boot loaders initialize the minimal set of hardware required for the device to run. The SoC firmware boot loaders are designed to finish as fast as possible, and nothing is drawn to the screen while they're running. After the SoC firmware boot loaders finish, the device is booted into the UEFI environment.
The SoC firmware boot loaders also contain an emergency flashing capability that allows devices to be flashed when the boot environment isn't stable and Full Flash Update (FFU) image-based flashing using the Microsoft-provided flashing tool isn't possible. Emergency flashing requires tools specific to the SoC. For more information, contact the SoC vendor.
Windows 10 utilizes the Unified Extensible Firmware Interface (UEFI) to support the handoff of system control from the SoC firmware boot loader to the OS. The UEFI environment is a minimal boot OS upon which devices are booted and the Windows 10 OS runs. For more information, see UEFI in Windows.
The Windows Boot Manager is a Microsoft-provided UEFI application that sets up the boot environment. Inside the boot environment, individual boot applications started by the Boot Manager provide functionality for all customer-facing scenarios before the device boots.
After the UEFI environment launches the Boot Manager, the Boot Manager initializes boot libraries, reads the boot configuration database to determine which boot applications to run and in which order to run them. The Boot Manager launches boot applications sequentially, and each application exits back to the Boot Manager after finishing.
Boot libraries are libraries of functions that extend upon existing UEFI functionality, and are designed to be used within the boot environment. Only boot applications, which are launched by the Boot Manager, have access to the boot libraries.
In non-retail OS images, the Boot Manager next runs an offline crash dump boot application that allows the device to capture a snapshot of physical memory from the previous OS session. When the device resets abnormally, the previous OS session's memory is preserved across the reset. When this happens, the offline crash dump application saves that memory and turn it into an offline crash dump file, which can be transferred off the device and analyzed. If the device didn't reset abnormally in the previous OS session, the offline crash dump application exits immediately.
In all OS images, the Boot Manager next runs mobilestartup.efi. This application runs several boot libraries, some of which are only run on first boot (for example, to provision the secure boot policy) or only in non-retail images (for example, to enter USB mass storage mode). The following libraries are always run:
First, mobilestartup.efi runs the library that implements UEFI battery charging. This library allows the user to charge their device while the device is in the boot environment (or is perceived as being turned off). This library is run first to ensure that the device has enough power to fully boot. For more information about scenarios involving the battery charging application, see Battery charging in the boot environment.
Next, mobilestartup.efi runs the libraries that implement flashing, device reset, and updates. These libraries determine whether the device should boot to flashing or device reset mode, or if the device should continue to the Update OS or Main OS.
I'm trying to dual boot Ubuntu alongside Windows on my laptop. I already know how to install it. A tutorial that I watched recommended selecting the Something else option of the Installation type screen of the Ubuntu installer rather than installing Ubuntu alongside Windows Boot Manager.
Choosing "Install alongside Windows boot manager" is safe, but please do take note of everything to avoid creating issues with your hard disk. If you are in any doubt, stick with the "Something else" option only.
It's not always safe to choose that option. If there is already a Windows EFI system partition, the Ubuntu installer will often detect it and use the existing Windows system partition instead of creating a new one, but if the Ubuntu installer did not correctly identify the existing Windows OS it's possible that it also did not identify the partition that is used by the computer to boot Windows, if such a partition exists. In such a case it's possible that Ubuntu will not install the grub bootloader because it doesn't know where to install grub, and the entire Ubuntu installation will abort. If this happens you can still install Ubuntu by choosing the Something else option at the Installation type screen of the Ubuntu installer.
The EFI System Partition (ESP) is a partition on a data storage device (usually an HDD or SSD) that is used by computers adhering to the Unified Extensible Firmware Interface (UEFI). The EFI System Partition is an interface that's used by the computer to boot Windows. It's like a step that is taken before it runs the Windows partition. It's a small partition, but without that partition your computer wouldn't know how to boot Windows.
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