Call your ISP/mail host/whomever provides your e-mail services and ask them
to change it, and then change it to match in whatever e-mail client software
you're using. Or, if you're talking about changing your display name, etc.,
change it in your mail client.
This isn't a Windows XP issue.
(Also - please don't type in all caps. It's hard to read and is considered
"shouting". )
