If the system doesn't boot up normaly, that is your only option.
it is the bios ( basic input output system) located in ROM
Diagnostic software locates problems within the software, hardware, or any kind of combination thereof within a system, or network of systems. It provides users the needed assistance in isolating the problem, normally within the primary operating system of the computer(Linux, Windows, etc.). Once a problem is isolated with diagnostic software, it can be resolved.
System password: PC bios password. this can be found and set at bios mode [hit del at booting]. Software password: Normal Software password.
diagnostic software has special features for system maintenance, they are there for multiple task i.e scan,update, and remove/delete malicious programs in the system.
A Diagnostic software is something that is use to identify/diagnose certain conditions in your system. for example an anti virus software can be considered a diagnostic s/w because it can diagnose virus infections in your machine and protect it.
System software that is responsible for the functioning of all hardware parts and their interoperability to carry out tasks successfully is called an operating system (OS). OS is the first software to be loaded into computer memory when the computer is switched on and this is called booting.
It is a system software and all the processes in the operating system can be controlled by the user.
Both are software, operating system is software that will make your computer boot up and run. while Application software is a program that will run on a functional operating system.
regular shut down system is called cool booting.
it helps to operate the application software and the system software of hte computer
Booting is the act of switching on the computer and loading the operating system. This process is referred to as cold booting
Registry errors are main reson for that so to clean registry errors try for registry cleaner software........