This Knowledgebase article describes a known issue with the Microsoft Full Text Search (Msftesql) service on Microsoft SQL Server 2005 and its interaction with Neverfail Heartbeat for SQL Server.
When stopping the protected application or switching using Neverfail Heartbeat the Msftesql service may restart after it has been stopped.
SQL Server 2005 does not have Service Pack 1 and Hotfix pack 2153 installed.
In order to resolve this problem please apply Service Pack 1 and Hotfix pack 2153, for Microsoft SQL Server 2005.
Please consult the appropriate Microsoft documentation for further information.
Microsoft SQL Server 2005