This thread seems forgotten, but I got the same problem as Naesstrom has (or had), the missing tbs.dll. that dialog pops up serveral times during the first phase of vista installation. Closing all dialog, installation continue and succeed. However, it's pain for unattended installation, so solution helps. < Conditions > vLite Version: 1.2 Vista Edition: Vista Home Basic Language Settings: Japanese Other: look at Last Session.ini Please test the case with the attached preset if you had time to spare. Thanx. Last_Session.ini