Changing the username is not that difficult! See: http://www.eightforums.com/tutorials...ndows-8-a.html
Also, changing the username doesn't change the user account name; for that you need to create a new account (which is also quite easy).

Accessing the folder where the Word executable is stored won't let you do anything that has any effect on the username or the user account name.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]