SAP Crystal Reports failing opening the Internet connection

Hi there,
When I turned off my PC this error appeared suddenly. I click OK and nothing happens but it appears every time I want to turn off my PC. Any solution for this ? What it means and what is causing this error?
Thank you !

Failed to open the connection.
Details: ADO Error Code: 0x80004005
Source: Microsofot OLE DB Provider for SQL Server
Description: [DNBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.
SQL State: 08001
Native Error: 17 [Database Vendor Code:17 ]
OK
