Hello Sir,
I wanted to report that I am facing the same problem as the one faced by Mengling Stuckman (dated: .)
It does not appear to be problem with the operating system because I am facing the same problem in systems with windows 7 as well as windows xp.
I have tried a fresh install on a new system with windows 7 os, and the same problem occurred. Even a simple artemis file in which I have just imported and saved the processed file from athena cannot be re-opened in artemis.
Kindly sort out the problem.
I have attached one sample artemis file which is giving the problem and also the demeter log file from %APPDATA%\demeter.

Thanking You,
-- Yours Sincerely,
Badari Narayana. A. R.
Ph.D Student, Nanoscience and Nanotechnology,
c/o Prof Rajeev Ranjan,
Electroceramics Lab,
Department of Materials Engineering,
Indian Institute of Science.