windows vista beta 2 ci dll missing corrupt

I downloaded WVB2 (64) and burnt the image to a DvD 2 times.
I come up with CI.dll missing or corrupt when installing WV. Has anyone else had this problem? Do I have to download WVB2 again?

Microsoft states that nearly three quarters of problems installing Vista involve file copy problems and almost all of those result from burning the dvd at too high a speed. They recommend your lowest available speed.
"Confussed.." wrote in message

I downloaded WVB2 (64) and burnt the image to a DvD 2 times.
I come up with CI.dll missing or corrupt when installing WV. Has anyone else had this problem? Do I have to download WVB2 again?