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By Press Release,
Just like SQL Server 2000 Service Pack 3, which became Service Pack 3a, now it's SQL Server 2005.
Service Pack 2 for SQL Server 2005 is now Service Pack 2a and it's been updated to fix the maintenance plan issue.
Download it and throw away your other copies. If you've already applied the old one, you can learn how to update your system in this kb article
SQl server Stop Service
Restart SQL Server services
SQL Server Notification Services
Sql server Integration services.
Audit SQL Server Service Recycle