First of all, PXE is a computer diskless (that is, no hard disk) technology.
Pre-boot execution environment (PXE) refers to those methods that enable IBM-compatible computers (often running Windows systems) to boot without a hard disk or a bootable floppy disk.
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If your computer knowledge is not mature, you may accidentally enter the BIOS to change the first startup item. Usually, the PXE system is just below the Windows system. We provide you with a very convenient solution: Press the Delete key to enter the BIOS. After booting, press the DEL key and hold. After entering the BIOS, switch to the "BOOT" tab, and set the first startup item of " Boot Option #1" to "windows boot manager" "then press F4 to save and exit.
This is a video tutorial:
In another case, if you shut down the computer when the power is cut off or shut down the computer while the system is being updated. This may cause damage to the computer system files. At this time, the BIOS will select other startup items to start the computer and keep trying in numerical order...
So when the Windows system file is damaged, the system recognizes the PXE system, and it will choose to start the computer with the PXE system. We can only reinstall the system to make the Windows system work again.