unclebuck,

I had the same problem trying to burn the ISO with the UDF msg. My solution. Using Nero Burning Rome, I started with the "file" "open" and selected the ISO. I then proceeded as directed and burned the ISO with no problem. I have no idea why this worked, but work it did. I can only assume the proper settings were done by Nero. I now have RC1 up and running on a different partition. So far it is working fine except for the accelerated raid driver on my asus p4p800 motherboard disc. I am unable to see my SATA drives. (I have two ide and two sata installed) I also need to upgrad to another graphics card.

I hope this helps.