SQL Server instalation log location

If your SQL Server installation directory was "C:\Program Files\Microsoft SQL Server", then the summary log produced by your SQL Server installation can be found at:

SQL Server 2012 - C:\Program Files\Microsoft SQL Server\110\Setup Bootstrap\Log\Summary.txt
SQL Server 2008 - C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\Summary.txt
SQL Server 2005 - C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\Log\Summary.txt

If you installed SQL Server to a different folder, replace default installation path "C:\Program Files\Microsoft SQL Server" with your installation path.