username and password

you steal my pleasures that hell went me out from shut down cause my computer threw away my password since 2013 , I tried again again again again again again what is wrong adobe systems went hell made me no longer flash player from my password flied away where my memory gone and many many passwords in my computer made my pleasure gone forever!!!!!!!!

This is the operating system, not Flash Player, prompting for the password.  Refer to What userid & password do I need to install Flash Player?  for assistance.

You don't need any userid or password to download Flash Player.

You may need however your computer's administrator password to install it.