如何消除Win 7中的异常“未在本地计算机上注册\'Microsoft.ACE.OLEDB.12.0\'提供程序”

_connectionString = \"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\\\"\" + excelFile + \"\\\";Extended Properties=\'Excel 8.0; HDR=NO; IMEX=1\'\";
        }

DataTable table = new DataTable();
            OleDbCommand command = new OleDbCommand();
            command.Connection = new OleDbConnection(_connectionString);
            command.CommandType = CommandType.Text;
            command.CommandText = \"select * from [NameOFExcelSheet$A1:D20]\";  // Want to read the Excel sheet. The name of Excel sheet is \"NameOfExcelSheet\". Wan to read the celles in the range A1 and D20.

            OleDbDataAdapter adapter = new OleDbDataAdapter();
            adapter.SelectCommand = command;
            adapter.Fill(table);  // EXCEPTION OCCURS IN THIS LINE.