Laptop Battery for Compaq CQ42 - CQ62 - HP G42 - G62 - G72 Import Original

Rs.1,437

What is the difference between a Windows / Dos / Ubuntu Laptop ? Which One Should I Buy ?

Windows, Dos or Ubuntu are basically operating systems, software part of the laptop. It is just that Genuine Windows Come at a Price ( say around Rs.5000) So Laptops with Windows Pre-loaded are a few thousands more expensive than the laptops which do not come with windows pre-loaded.