Now that you have done custom installation as posted in my previous post. But as in some cases you can not upgrade certain language versions of Windows XP to Windows Vista (KB932856 ).
So now, how to restore personal files in such cases ie how to move personal files from their former folders to the corresponding folders in Windows Vista.
For that , there's a nice KB article 932912, "How to restore your personal files after you perform a custom installation of Windows Vista".
So after custom installation, Vista creates Windows.old folder to store the files from the Windows XP installation.
This articles informs us about how to restore personal files from Documents and settings folder for each user , restore recorded television shows if its a Media center edition, restore Internet Explorer favorites, restore the Desktop folder, My documents folder from its earlier version to Vista.