SQL2008 Cluster error. 'RequireKerberos is 1'

Hi

I am installing a SQL 2008 cluster in a 3 node guest cluster.

I had this error:
'RequireKerberos is 1'

I followed this Q to solve the problem
We need to stream SQL 2008 dVD with SP1
http://support.microsoft.com/kb/955392/en-us

sAntos