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== XP: Standard PC with C-Step i486 ==When XP is first installed it tries to determine what type of BIOS is available on the computer. Newer systems have what is known as Advanced Configuration and Power Interface (ACPI) capability. If you press F5 just as the blue setup screen appears, you will see a menu allowing you to choose: Standard PC with C-Step i486 OtherOn some less commmon motherboards this menu is triggered without having to press F5 because the Windows setup program could not determine if the BIOS is ACPI capable.Once you drop the CD in the tray and fire up the computer to install XP, the first thing you'll see at the bottom of the screen is the option to press F6 if you need to install a SCSI or RAID controller. Don't press F6. Press F5 instead. This will take you to a separate menu of Hardware Abstraction Layer's where you can choose an appropriate HAL that supports ACPI.There are situations where it is definitely not desirable to use an ACPI HAL even if it is supported by the BIOS. This predominately applies to servers, but to ensure that an ACPI HAL will not be used or automatically detected and used, press F7 instead of F5. If you press F7, the Standard PC HAL loads and the ACPI compliance check is bypassed.[http://support.microsoft.com/kb/299340 How to force a Hardware Abstraction Layer during an upgrade or an installation of Windows XP] <BR>Article ID: 299340To determine if your computer was detected as being ACPI enabled:#Right click My Computer then click Properties > Hardware > Device Manager.#Expand the entry called Computer. #If the entry is 'Advanced Configuration and Power Interface (ACPI) PC' you're all set. If it says 'Standard PC' the computer BIOS was not detected as being ACPI capable.