The access control list fouls up in some computer installations with the SQL server. The files are corrupted and you need to remove all the SQL server files.
Uninstall from control panel if you have them listed there Microsoft SQL Server native client Microsoft SQL Server Setup Support files Microsoft SQL Server VSS writer
Moved directory C:\Program Files\Microsoft SQL Server\MSSQL.1 to another location for possible use.
Then deleted everything under Microsoft SQL Server in c:\Program Files
No w reinstall your program and it should install properly this time!
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