Currently (July 2010) I practice just the SBS2008 installation. I had several attempts, sometimes with times without a response file, sometimes with even without automatic update, now with even without a functioning Companyweb (SBS SharePoint)
After many gray hairs I have now found a solution: http://support.microsoft.com / kb/971272
So, after the last attempt, with automatic update and answer file, which is to set the IP address and domain name meinedomaene.local, it came back the error when calling http://companyweb on the SBS2008 server. Probably at this point was mentioned in support, installs the leading update with error. Solution No. 3 was the hit:
HKEY_LOCAL_MACHINE \\ SYSTEM \\ CurrentControlSet \\ Control \\ Lsa \\ MSV1_0 \\ BackConnectionHostNames = companyweb.meinedomaene.local
