http://doc.pfsense.com/index.php/HOWTO_Install_pfSense#Standard_.28ISO.29_Installation

Standard (ISO) Installation

* Restart your computer and enter your BIOS configuration screen.

* Find and turn off the Plug-and-Play OS, and any ACPI/APM options. Disable any unnecessary onboard devices, such as sound cards, parallel ports and internal modems.

* Change the primary boot device to your CD-ROM drive, insert the pfSense Live CD and restart your computer, saving the BIOS changes.

ACPI やサウンドをオフにしなければならないのでしょうか?