Issue
Why does the install for SQL 2005 take so long?
Environment
SQL 2005
Cause
Under certain conditions during the SQL 2005 installation process it could look like the installation hangs at "Setting File Security". This is a known problem with Microsoft.
Resolution
The workaround is to disconnect machine from the network and then the install should go through quickly.
A cumulative hotfix is available from Microsoft that will address this issue. It can be found at https://support.microsoft.com