KBA: Articles on SQL Server 2005, 2000 & MSDE Installation issues
The following pages were recently modified.
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition, SQL Server 2005 Standard Edition & SQL Server 2005 Enterprise X64 Edition
Notification Contents: New
SQL Server 2005 installers do not update an instance of the SQL Server service that is in a disabled state
http://support.microsoft.com/kb/953739/en-US
SQL Server 2000 and MSDE 2000 installers stop dependent services
http://support.microsoft.com/kb/953742/en-US
SQL Server 2005 installers stop dependent services
http://support.microsoft.com/kb/953741/en-US