If you don't know your "old" computername you may edit the savegames with some hex-editor or you can use a tool called dsbackup:
http://www.tgeweb.com/ironworks/dark...sbackup105.zip
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... Many are my names in many countries. Mithrandir among the Elves, Tharkûn to the Dwarves; Olórin I was in my youth in the West that is forgotten, in the South Incánus, in the North Gandalf; to the East I do not go.