You might be a software professional or Student planned to purchase new laptop.
Obviously, you would like to save money and get good quality laptop. 

Laptops are coming with Pre installed operating system and without windows (Free DOS).
As you are a developer or student you may don’t need that pre installed home edition of windows
where you have restrictions to install development kinds of stuffs. Or you may have pirated copy of
windows or you may want to install Linux or free OS like Ubantu etc. 
Believe me you will save 8000 to 9000 rupees if you choose Free DOS OS. Later you can install the OS
of your wish.

For those who want to buy new laptop ask retailers for free DOS and save big big money.