FIX: After you enable the Address Windowing Extensions (AWE) feature in SQL Server 2005, access violations may occur, and SQL Server 2005 may stop responding
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition & SQL Server 2005 Standard Edition
Notification Contents: New and Major Modifications
FIX: After you enable the Address Windowing Extensions (AWE) feature in SQL Server 2005, access violations may occur, and SQL Server 2005 may stop responding
http://support.microsoft.com/kb/941695/en-US