Error 84B20001 if install Microsoft SQL Server 2008 Service Pack 1

SQL Server Setup has encountered the following error:
A Failure was detected for a previous installation, patch, or repair For instance ‘<instance_name>’ during configuration for features [SQL_Replication_Core_Inst (or) SQL_Engine_Core_Inst (or) MPT_AGENT_CORE_CNI]. In order to apply this patch package (KB2072493), you must resolve any issues with the previous operation that failed. View the summary.txt log to determine why the previous operation failed.

Error code 0x84B20001.

Solution:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL10_50.<instance_name>\ConfigurationState

MPT_AGENT_CORE_CNI
SQL_Engine_Core_Inst
SQL_Replication_Core_Inst

All REG_DWORD values set to 1.

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