Cannot select features to install from SQL Server 2005 SP4 installation process The issue: I cannot select MSSQLSERVER from the feature list I want to update as part of the SQL Server 2005 x64 Service Pack 4 installation process. 
Please note exe file is being raised from C:\ with full administrador privilegies.



Server details: Windows Server 2008 R2 Standard x64 bits 
SQL Server details: Microsoft SQL Server 2005 - 9.00.5294.00 (X64) (Build 7601: Service Pack 1) 
Service Package Details: SQLServer2005SP4-KB2463332-x64-ENU.exe

I have spent the last hour trying to identify where the issue is or similar experiencies over internet but I didn't get it until now. 
Any comments will be appreciated.

Thanks in advance
You are running SQL Server build 9.00.5294.00 that is more current than SP4 which is 9.00.5000. Your server has already been updated. (http://sqlserverbuilds.blogspot.com/) 
(Build 7601: Service Pack 1) is the version of the operating system.