preview-latex equips your source buffer with a sophisticated WYSIWYG previewing and folding conglomerate that revolutionalizes the edit-compile-preview cycle. That means, instead of LaTeX constructs, images of their typeset output are placed in the buffer. It is therefore particularly suited for easing the creation of complex content like math formulas, programmed graphics, or text transcriptions.
There is problem for preview functionality, what is resolution here is enter the Miktex installed directory, in my case is
C:\Program Files\MiKTeX 2.6\miktex\bin
change the yap to xdvi.
The reason for this operation is preview functionaliy here is "xdvi file.dvi", however, can not find xdvi in miktex, we just change the command name as xdvi here.
To produce PDF file:
dvipdft file.dvi
To produce PS file:
dvips file.dvi