Hi and thanks for reaching out. My name is William. I'm a Windows technical expert. I'll be happy to help you out today.
This implies that your computer is trying to boot using the RealTek network adapter. PXE refers to the Preboot Execution Environment where the network adapter is looking for OS setup files to install. To resolve, so into the BIOS for your computer and change the boot order to put the hard drive at the top of the list and/remove the network adapter from the list altogether.
If you still cannot boot, that would imply that your computer is no longer detecting the hard drive or boot configuration data is missing from the drive.