I have Server 2008 Enterprise running on two virtual machines, running on a
VMWare ESXi system, with shared disks required all set up. The verification
wizard passed all tests - not even any warnings. I set up the MSCS portion
and installed SQL 2008, chosing the 'New SQL Failover Cluster Installation'
option. All completed successfully, and the single-node SQL 2008 cluster
looks healthy.
Now I want to add the second node of the cluster. I first try to install
SQL 2008 SP1, since I've read this is advisable to do. But each time I run
SP1, it bombs out. Here is the text included in the message:

Description:
Stopped working

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: setup100.exe
Problem Signature 02: 10.0.2531.0
Problem Signature 03: 49cfb78d
Problem Signature 04: Microsoft.SqlServer.Chainer.Infrastructure
Problem Signature 05: 10.0.0.0
Problem Signature 06: 49cfb78b
Problem Signature 07: 149
Problem Signature 08: 9e
Problem Signature 09: ZAGSF01GRLFWVJMY5S0U0HXSJJE2HDT4
OS Version: 6.0.6001.2.1.0.274.10
Locale ID: 1033

Any ideas what to do here?

Thanks