I received this error a while ago...I forgot what exactly did I do to resolve that but all I can think now is....
check if services related to SQL Server are running under services.msc console (specially by name SQL Server Agent (MSSQLSERVER) and SQL Server (MSSQLSERVER)).
Go to the SQL Server Configuration Manager, Microsoft SQL Server 2005>>Configuration tools>>SQL Server Configuration Manager, and start the SQLEXPRESS service. Just put it to automatic.
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