BTW, there are some more issues with copying data from user profile. The safest would be to copy most stuff from
C:\Documents and Settings\Your Name
because if you take only My Documents that does not include useful data like your Outlook Express e-mail boxes and address book.
However, since Microsoft has decided to store a lot of fast changing garbage (like Temp folder, web browser caches etc) in user profile folder, then you'll end up copying a lot of useless stuff. So there needs to be done some filtering about what is useful and what is not, if you decide to copy all from your user profile folder.