How to solve a deadlocked transaction in SQL Server 2005

Hi,

I have only one table in my database, i created 4 single indexes on it.
I have an application in C# .NET using LINQ with 2 threads:

THREAD 1: Insert new records in this table
THREAD 2: Read record and update them

I do not understand why i got this exception:

System.Data.SqlClient.SqlException: Transaction (Process ID 54) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
   à System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   à System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
   à System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
   à System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   à System.Data.SqlClient.SqlDataReader.HasMoreRows()
   à System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout)
   à System.Data.SqlClient.SqlDataReader.Read()
   à System.Data.Linq.SqlClient.ObjectReaderCompiler.ObjectReaderBase`1.Read()
   à System.Data.Linq.SqlClient.ObjectReaderCompiler.ObjectReader`2.MoveNext()
   à System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   à System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

How to solve this exception ?

Here is my database script

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Recipient](
      [RecipientId] [uniqueidentifier] ROWGUIDCOL  NOT NULL CONSTRAINT [DF_Recipients_IdRecipient]  DEFAULT (newid()),
      [NewsletterId] [uniqueidentifier] NULL,
      [Email] [nvarchar](100) NOT NULL,
      [Domain] [nvarchar](50) NULL,
      [Message] [ntext] NOT NULL,
      [Processed] [bit] NOT NULL CONSTRAINT [DF_Recipient_Processed]  DEFAULT ((0)),
      [Status] [int] NOT NULL CONSTRAINT [DF_Recipient_Status]  DEFAULT ((0)),
      [CreatedOn] [datetime] NOT NULL CONSTRAINT [DF_Recipients_CreatedOn]  DEFAULT (getdate()),
      [SentOn] [datetime] NULL,
      [QueuedOn] [datetime] NOT NULL CONSTRAINT [DF_Recipient_QueuedOn]  DEFAULT (''),
      [Journal] [ntext] NULL,
      [Retry] [int] NOT NULL CONSTRAINT [DF_Recipients_Retry]  DEFAULT ((0)),
      [Priority] [int] NOT NULL CONSTRAINT [DF_Recipients_Priority]  DEFAULT ((0)),
      [Version] [timestamp] NOT NULL,
      [Duration] [int] NULL CONSTRAINT [DF_Recipient_Duration]  DEFAULT ((0)),
      [ReceivedOn] [datetime] NULL,
 CONSTRAINT [PK_Recipients] PRIMARY KEY CLUSTERED
(
      [RecipientId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
CREATE NONCLUSTERED INDEX [IX_Email] ON [dbo].[Recipient]
(
      [Email] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
GO
CREATE NONCLUSTERED INDEX [IX_Newsletter] ON [dbo].[Recipient]
(
      [NewsletterId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
GO
CREATE NONCLUSTERED INDEX [IX_StatusProcessed] ON [dbo].[Recipient]
(
      [Status] ASC,
      [Processed] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
GO

Thank you