Just to be 100% clear, the Xp --> W7 path is NOT an upgrade. All the automated upgrade
does is backup personal data, then wipes the XP operating system and all apps, then
installs Windows 7. Nothing from XP or your previously installed apps will remain after
the "upgrade". So to echo what was said, there is no upgrade from XP-->W7. It's
simply marketing speak for Microsoft so people aren't scared off. I know of a few people
who did the upgrade never reading any of the finer points/prints and were burned when they
found out only their personal files were saved.
If someone was to migrate
(better term for this process) from XP-->W7, I would recommend using the migration
utility. It does a good job backing up some smaller items you may overlook.
So you basically download this tool, run it on your XP (or Vista) install, then
wipe the drive, install 7, then use the same utility (built-in with Windows 7) to import
that data into your new install.