Question

....is box that appears on a computer screen asking the users to choose,what they want the software to do

Answer 1

these type of boxes are called alert box/ configuration box!!

Answer 2

Dialog box is box that appears on a computer screen asking the users to choose, what they want the software to do. In general, the dialog box pops up for any action performed by the user.  It contains the instructions or the information that the user needs to perform. Thus, the user can select the option and specify what the software must perform.