Try to install MS Visual C++ 2008 Redistributable Package.If you install the library and it did not help, please write to the author on program page or write to e-mail jenyay.ilin@gmail.com with a full error text.
Keeping notes in a tree - the main feature, for which the program was developed. This does not mean that someday I will not add the option for choosing ways of storing your notes, but this will not happen in the near future.
There are some thoughts to make a separate page type format RichTextFormat with the visual editor. Please do not exclude the possibility that there will be a visual editor for HTML-pages. But still I can't talk about dates.