hi alan1998,

Actually, there are two versions of system boot programs now available:

[ol]- BIOS (Basic Input/Output System). It is the legacy boot firmware system that’s been around for forever. IBM PC’s.

  • UEFI (Unified Extensible Firmware Interface) This is the latest system firmware boot program. It is found only in modern computer systems and is usually loaded as system firmware in Win 8 systems.[/ol]

For more detail as to the differences between the two, see: (UEFI) http://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
(BIOS) http://en.wikipedia.org/wiki/BIOS

Of note, when using UEFI, it can be difficult or impossible, depending on version of UEFI and options lacking or within it, to dual-boot another os such as linux.

So, when setting up a Win 7 os to run on UEFI, you may need to change default settings within it to get Win 7 to boot. One such setting is to select ‘corporate environment’ setting as a workaround. One stated reason for UEFI is enhanced security over legacy BIOS.