Basic Security advise, Why are you saving your critical passwords in a notepad file on your hard drive? Passwords can be manipulated or stolen or hack your main hard drive or your external hard drive. I wouldn't recommend to keep passwords on the hard drives because of spy ware or virus.
To answer your notepad question
Can you try to select all and pick out a new front? Might be your computer is not correctly install comic sans front.
Is it not showing your notepad file? I would check for hidden files and folders if you accidentally hide it. http://www.bleepingcomputer.com/tutorials/show-hidden-files-in-windows-7/
I wouldn't do Remove the checkmark from the checkbox labeled Hide protected operating system files (Recommended). because that option hides the systems files which operate your computer
AA in Computer Networking Technology
BS in Information Technology
Comptia A+, Project+, L+