vim auto indenting even after setting noai option

I am using vim 7.2 from putty terminal. Even if I run set noai it seems vim still trying to indent code. I am copying my code from Notepad++ to vim. following is from Notepad++ and following what I got in vim: I don't have any tab in my file. As a workaround I am opening old vi run set noai paste save and open in vim again. Any suggestion how to correct this behavior ?