Data Extractor

I want to create a financial database of all public companies listed on Bombay Stock Exchange and National Stock Exchange. I want a program that will source the data from a reliable public database as and when required. For e.g. - see [login to view URL] - I need the relevant data for each line item and year in balance sheet, profit and loss, quarterly results, and cash flow statements for all public companies (see A-Z at bottom of site) for at least ten years in one database. It should also update for latest market price (see 'Quotes' and 'Market Cap'). I would like for this to be a software that will run on Windows, which can be updated for data at the click of a button. Most important factors are that it runs reliably (i.e. uses a backup source - such as Economic Times - '[login to view URL]') and runs indefinitely without need for maintenance. Please feel free to contact me by email for further clarifications if required. Thanks for your time. Kind Regards, Aneesh Itty