Failed to install Vista Beta 2 on MS Virtual server R2

Hi,

I used to run Vista February CTP on Virtual Server R2 hosted by XP Pro. I tried to install Vista Beta 2 on the Virtual Server, but got "setup was unable to find the windows end user license agreement" error message right after I entered product key. I tried creating new virtual disk and manually creating primary partition on it - to no avail. I also tried installing from mapped ISO and real DVD drive, and still no luck.

Any idea how to make Vista Beta 2 run on Virtual Server

Thank you,
Vlad.