> Yes. I will re-try. 1. checking latex configuration -> miktex package installation -> install, and this time no error. Previous error message should be caused by the same 'program files' problem.
2. I am prompted to install packages during configuration, and when I open a document using basic packages like natbib and fancyhdr. Is it possible to install these packages by default? 3. I try to open a file using beamer class. Lyx says beamer class is not found. Despite the fact the miktex can fetch required packages automatically, I have to install beamer manually and then run re-configure. (I am glad to find that beamer.layout is pre-installed.) The ideal way to handle this problem may be: (I know it is non-trivial but the new configure.py should be able to add this feature easily) "lyx try to open a file of unknown class -> lyx calls miktex and let it install this class -> lyx fetch a layout file from some lyx repository (or raise an error saying no layout file) -> lyx recognize this class without re-configuration -> lyx open a file." Anyway, if the 'program files' problem can be fixed, this installer will be quite usable. Thank you! Bo