I just started getting the above error when trying to boot a media director.
This is for the same setup as I've posted on before (Asus_M3A78-EM with AMD 64bit 4200+) using the 64bit DVD installation. I was trying to get my N810 working with the above setup and ended up deleting the installation information for the 32bit computer- oops.
So, this computer had been working with this setup and then I deleted it. For whatever reason, now when I try to PXE boot into it, I can get an ip address from the server and it begins the data transfer, but then kicks out with the above error.
I have another 64bit computer that I was able to get everything installed using....
I am unable to disable ACPI completely, it just says there are different modes that I can change it to. It was working, now it's not, not sure why.