Symptom:
While installing SQL Server 2005 you might get an error during the installation of the prerequisites:
Click the second column of the first row ("Setup failed. Refer to the Setup log for ...") to open the installation log.
Look for the following error:
Product: MSXML 6.0 Parser (KB933579) -- Error 1706. An installation package for the product MSXML 6.0 Parser (KB933579) cannot be found. Try the installation again using a valid copy of the installation package 'msxml6.msi'.
Reason:
This error is due to the fact that the existing MSXML installation on the computer is corrupt. This causes the SQL Server 2005 prerequisites installation to fail.
Solution:
Uninstall the existing MSXML 6.0 package from the computer and re-run the SQL Server setup program:
The SQL Server 2005 Setup program will install a fresh copy of the MSXML 6.0 parser package.