On a computer that has a 64-bit processor, you receive an error message in SQL Server Management Studio when you connect to SQL Server 2005 Integration Services or when you create or edit a maintenance plan
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition, SQL Server 2005 Standard Edition & SQL Server 2005 Enterprise X64 Edition
Notification Contents: New and Major Modifications
On a computer that has a 64-bit processor, you receive an error message in SQL Server Management Studio when you connect to SQL Server 2005 Integration Services or when you create or edit a maintenance plan
http://support.microsoft.com/kb/919224/en-US