SQL Server 安装程序遇到以下错误:

A failure was detected for a previous installation, patch, or repair for instance 'MSSQLSERVER' during configuration for features [SQL_FullText_Adv,]. In order to apply this patch package (KB968369), you must resolve any issues with the previous operation that failed. View the summary.txt log to determine why the previous operation failed.

错误代码 0x84B20001。

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http://connect.microsoft.com/SQLServer/feedback/details/421601/sql-2008-sp1-fails-with-error-code-0x84b20001#

解决方法：
由 npiaseck 在 2009/7/5 15:33 发送
This seems to be a bug with the 2008 installer whenever you do an Edition Upgrade, such as if when you forgot to install Management Studio Express and did an edition upgrade to get it. The SQL Sever 2008 installer appears to leave things in an inconsistent state after doing an Edition Upgrade.
To work around this bug that Microsoft seems to think is not a bug:
Step 0. If you have Visual Studio 2008 SP1 installed, you MUST first remove "Microsoft SQL Server Compact 3.5 SP1 " via Add/Remove Programs as described in http://support.microsoft.com/default.aspx/kb/970876. (It will get re-installed later during the repair; this works around yet another bug in SQL Server 2008's installer.)
Step 1. Download and run the original self-extracting installation of SQL Server 2008. If you have installation media, you can use the "SQL Server Installation Center" option in your Start menu.
Step 2. Choose Maintenance > Repair. When asked what to repair, choose "<<Repair shared components only>>", then let the repair complete. Then close the SQL Server Installation Center. (You shouldn't have to repair any instances.)
Step 3. You should now be able to run the SP1 installer.
Good luck! Here's hoping that they rewrite the entire installer in 2010.

简单地说，就是MSSQL Server 2008安装时，出现了错误，导致sp1补丁安装失败。解决方法：删除MSSQL Server 2008中的安装实例（出现错误的那个），然后重新添加一个安装实例。再安装sp1补丁，即可。