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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.Using F7 to disable 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. Using F5 to disable ACPI: This technique has been verified to work in our testing on a modern Intel Core 2 compatible motherboard. Using F5 to interrupt the install as described above, then selecting "Standard PC with C-Step i486" caused Windows XP to install without ACPI support.If you intentionally set out to disable ACPI support during the Windows XP installation, this is one indicator that you were successful. Your computer did not automatically power off when you quit Windows.[[Category:Windows]]