The information pulled by AutoComplete is stored in the AutoComplete Data
Store ('autoDS' as I call it). The autoDS is stored within the Windows
operating system in an encrypted form. More specifically, this autoDS
information is stored with the user's profile. For example, if UserBOB logs
on to a PC that has his profile (AutoComplete Enabled) and surfs the web,
using AutoComplete to fill in information, and then logs off the computer,
that information is stored in UserBOB's autoDS. So, if UserOLLIVER comes
along and logs on to the same computer, UserOLIVER will not be able to pull
UserBOB's AutoComplete information.
Use AutoWhat to edit AutoComplete words.
http://ww.pcmag.com/article2/0,4149,3116,00.asp