No dvd rom. i like to see dvd movies,but there is no dvd rom in my computer.ther is only a cd

Question

i like to see dvd movies,but there is no dvd rom in my computer.ther is only a cd drive which appears on my pc.i would like to install dvd by internet without any instructur or any serviceror by paying money.please try to find a solution to my problem.
thankyou sir