Hi,
What version of prestashop your are installing,what is the server,php version. You have given appropriate permission to folder and files to create and update files during installation.
Do you find any error in log file (application or server).
Please provide more information to investigate the problem.
PrestaShop Tutorials Videos [How to do Tasks]
https://www.prestashop.com/forums/topic/907438-prestashop-tutorials-videos-how-to-do-tasks/