When trying to copy files into Windows 7 from your XP computer (Documents, Pictures, etc) you may get an "Access Denied" error or something similar. This is because you are copying files from your XP user account to Windows 7. If the account isn't password protected, then you might not have an issue. If it is, then Windows 7 should prompt you that you'll need to take ownership of the files, so that your new Windows 7 user account can access them. However, booting into XP and copying the files to your Windows 7 partition may make that unnecessary.