step1

check if python is installed or not.

on command prompt
type the following command :
python --version

if python not downloaded download it from its website

step2

check if pip is installed or not

on cmd
type the following command
pip --version

step3

install jupyter notebook

type the following command on the commmand prompt :
pip install notebook

step4

after successful installation
to open jupyter notebook

type the following command on the command prompt :
jupyter notebook

Done