IIS problem

hi,
i have a problem with IIS server which makes me crazy in these days.%90 everything works Ok about it,but sometimes it doesn't browse the php pages,the error is "page cannot be found".but it can't be,file is there,path is true.i mean there's nothing wrong in logic.

then what is the problem that sometimes it browses,sometimes not? by the wat it's not about the specific directory or a file!

any comment?

i couldn't find out why this happens but i got a simple solution, i just moved the directory from localhost/folder1/folder2 to localhost/folder2

now it works ok.If there's someone other who gets something similler,i hope this answer will help.