Ok, I've been using word for a long time now and recently downloaded and installed a new font, unfortunately when i tried using this font to type in microsoft word the program automatically changed the font back to times new roman after about 5 lines. I changed the font back to the one i had chosen to use and it took about a line and a half for word to revert back to times new roman without my consent or permission. 
Is there a reason this happening and if so what can i do to fix it?

Is there a reason this happening and if so what can i do to fix it?