On a Windows Vista Ultimate machine, when trying to install Windows Vista sp
1 from a CD one of the following two errors occur: 1) The machine says that
it must be rebooted to continue with the install. After rebooting (several
times sometimes) the same error will likely appear, or 2) The installation
just randomly fails (ie stops installing) and a generic 'Failed to Install
Service Pack 1' appears. The WinVista sp1 installation also fails when
trying to use Windows Updates. There are other machines on the network that
are basically just like this one as far as hardware and software and they
were able to update to WinVista Service Pack 1 and Service Pack 2 without any
problems.

We tried to disable the AV software and other random services. Are there any
tips, tricks, or suggestions in this scenario in order to successfully get
WinVista sp1 installed ? We would obviously like to not have to reinstall
the OS, applications, and data.

TIA ...

e.