The core (also called the kernel) of the Windows XP Professional operating system.
Code that runs as part of the kernel does so in privileged processor mode and has direct access to system data and hardware.
The registry file that contains the data used to create the registry key HKEY_LOCAL_ MACHINE\SYSTEM.
This key contains information that the operating system requires to start devices and system services.
In x86-based systems, startup failures that occur before the operating system loader (Ntldr) starts could indicate missing or deleted files, or it could indicate damage to the hard disk master boot record (MBR), partition table, or boot sector.If the floppy disk is not bootable, an error message similar to the following appears: The computer displays the preceding message until you insert a bootable floppy disk or until you remove the floppy disk and restart the computer.If you restart the computer without a floppy disk, the computer reads the boot code instructions located on the master boot record (MBR).The boot volume contains Windows XP Professional operating system files and folders such as used to associate string values, such as folder or file paths, to variables that Windows XP Professional applications and services use.For example, by using environment variables, scripts can run without modification on computers that have different configurations.Diagnosing and correcting hardware and software problems that affect the startup process is an important troubleshooting skill.