Failed to verify Authenticode signature on DLL msxmlsql.dll

Hello, I got this error message. The server is experiencing issue of service broker suddenly stopping, so we are ruling out all errors at this point. Server is setup with HADR.

Win Server 2008 R2 Ent SP1

SQL 2012 11.0.3349 Ent

Log Name:      Application
Source:        MSSQL$SQL01
Date:          4/18/2013 7:17:26 AM
Event ID:      33081
Task Category: Server
Level:         Information
Keywords:      Classic
User:          N/A
Computer:      SQL01.xxxxxx.xxx
Description:
Failed to verify Authenticode signature on DLL 'C:\Program Files\Microsoft SQL Server\MSSQL11.SQL01\MSSQL\Binn\msxmlsql.dll'.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSSQL$SQL01" />
    <EventID Qualifiers="16384">33081</EventID>
    <Level>4</Level>
    <Task>2</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-04-18T11:17:26.000000000Z" />
    <EventRecordID>28935</EventRecordID>
    <Channel>Application</Channel>
    <Computer>SQL01.xxxxxx.xxx</Computer>
    <Security />
  </System>
  <EventData>
    <Data>C:\Program Files\Microsoft SQL Server\MSSQL11.SQL01\MSSQL\Binn\msxmlsql.dll</Data>
    <Binary>398100000A0000000F000000500052004F004400530051004C0031005C0043004F00530051004C000000040000004F006E0065000000</Binary>
  </EventData>
</Event>

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Thanks.