hey, can somebody tell me what these file are: postinfo.html, _vti_inf.html , .htaccess ??
is it safe to delete any of these files or? or can i move them to another folder or something, because i just want the fiels for my site there so i don't have too many.

.htaccess tends to be quite important, so I'd leave that where it is. Any files within the public_html or public_ftp directories you are safe to delete, but nothing outside of those should be touched. Any of the files and other folders that appear should be left alone, otherwise you can make your hosting fail to work correctly. Various people have done things like that in the past and the results are generally not pretty.