You need to invest in a the periodic maintenance of your computer.

Sorry i don’t know the answer to this

You need to call the office. and then you need to give them a reason on why you want to change your username.

Answercrawler;

Placeholders  are the containers in  layouts  that hold such content as  text  (including body  text, bulleted lists, and titles),  tables,  charts, smartart graphics, movies, sounds, pictures, and clip art.  slide layouts  also contain the theme (colors, fonts, effects, and the background) of a  slide.