I have configured 2005 failover clustering many times, and I have never had this problem. When going through the installation, I keep getting the error in the screen shot attached. I have downloaded and the .iso several times. I have also tried this install directly from the console making sure nobody was logged in via terminal services. I even had the network admins extract the iso using a tool called power iso, and I still getting the error: "An installation package for the product Microsoft SQL server native client cannot be found. Try the installation again using a valid copy of the installation package 'sqlncli.msi'.
I have tried downloading the iso again from MS and extracting the files using a power iso tool.
Please help! I have to get this cluster built.