Download Compaq laptop driver
Link 1 : http://h20180.www2.hp.com/apps/Nav?h_pagetype=s-002&h_lang=en&h_cc=us&h_product=82710&h_client=S-A-R163-1&h_page=hpcom&lang=en&cc=us
Link 2 : http://www8.hp.com/in/en/support-drivers.html
Download DELL laptop driver
Link 1 : http://supportapj.dell.com/support/downloads/index.aspx
Download Acer laptop driver
Link 1 : http://www.acer.co.in/ac/en/IN/content/drivers