Every time at the beginning of the installation of Windows 2008 R2 on the X8ST3-F rev 2.00 motherboard with Rev 1.1 website BIOS and aa Intel XEON X5520 and 4x 4GB, I get the following error:
"The Bios in this System is not fully ACPI compliant. Please contact your system vendor for an updated BIOS."
We have seen this error before. Please contact our technical support team and request a pre-released BIOS called X8ST30.511. This update will solve your problem.