Try each of the following steps in order until the issue is resolved:  
  1. Open Start, Programs, Microsoft SQL Server 2005, Configuration Tools, SQL Server Configuration Manager.
  2. Expand the SQL Server 2005 Network Configuration item.
  3. Select Protocols for MSSQLSERVER.
  4. Right-click on Named Pipes and set the Status to Enabled instead of Disabled.
  5. Right-click on TCP/IP and set the Status to Enabled instead of Disabled. 

    Note: For more information, refer to How to Enable TCP/IP and Named Pipes for use with FundWare.