Suddenly the sqlserver express service can't start (2005).

Hi. My sql server express work well but suddenly stop to run. It can connect to the remote database ok but to my local database can not create a connection. On sql log I see:
2013-12-27 16:12:47.67 Server      Microsoft SQL Server 2005 - 9.00.1399.06 (Intel X86)     Oct 14 2005 00:33:37     Copyright (c) 1988-2005 Microsoft Corporation     Express Edition on Windows NT 5.1 (Build 2600: Service Pack 2) 2013-12-27 16:12:47.67 Server      (c) 2005 Microsoft Corporation. 2013-12-27 16:12:47.67 Server      All rights reserved. 2013-12-27 16:12:47.67 Server      Server process ID is 3124. 2013-12-27 16:12:47.67 Server      Logging SQL Server messages in file 'F:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\LOG\ERRORLOG'. 2013-12-27 16:12:47.67 Server& ...