Error message when you try to restore a database by using SQL Server Management Studio in SQL Server 2005 after you use the Backup tool: "Restore failed for Server '<ServerName>' (Microsoft.SqlServer.Smo)"
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition
Notification Contents: New and Major Modifications
Error message when you try to restore a database by using SQL Server Management Studio in SQL Server 2005 after you use the Backup tool: "Restore failed for Server '<ServerName>' (Microsoft.SqlServer.Smo)"
http://support.microsoft.com/kb/937683/en-US