To carry out manually what the FAST or Migwiz would do, all you need from the old system is the entire contents of the individual account name folders inC:\Documents and Settings. You need to go into Tools>Folder Options>View to tick to open up the hidden files and folders and tick to unhide protected system files so that you cna see and copy all the Application Data folders and Local Settings>Application Data folders.
That way, you get Documents, Music, Pictures and Videos along with all the details of how the programmes work. It won't copy programmes but if you reinstall those you had, you may find saved settings with some details like game scores will appear.
It usually helps in that if you go into C:\Windows\Syetsm32\Config and copy Software into the same folder in the new system. That's the Registry hive controlling software but in your case with the old system running only SP2, it may cause conflicts so make sure you save the new system's Software file before overwriting it. Call it Software.old and leave it in the correct folder.