Problems: Saving and Fonts

Hey Guys,

im using Illustrator for a couple of years now, but i still cant handle two problems:

1. i have most times a problem when i want to overwrite my File, especially with huge files.
the error says something like this "This file is read-only or already in use by another user[...]"

I can only save it when i "save as.." and give another name to the file.

(Here the Error - in german language)

2. When im looking for a good font, the "font picker" is always starting with A (See Picture below).
No matter if the name of the Font i have selected begins with another Letter.
I wish my selected font would be the first in the list, when i select it and i can continue looking for the next fonts.
Is there any setting to change this?

Hope someone know, how to fix my problems.

Greetings,
Jan