I just installed Miktex, and downloaded Latex Suite latest snapshot.
I extracted its files in both C:\Program files (x86)\Vim\vimfiles and C:\Program files (x86)\Vim\vim74 (I'm not sure why I have these two directories; it may be due to I have gVim and vim from cygwin).
I also edited my _vimrc to add the options that Latex-Suite installation guide says.
It seems to work, since commands like !latex and !yap example.tex are executed for a simple tex file. However, in gVim the menu tabs related to Tex do not appear. Also, the command "echo Tex_CompileRule_dvi" tells this is an undefined variable.
I'm afraid I might be missing some things attrying to use Latex within gVim...