.png images not displayed in lyx

[vsharma]

I use ver1.3.0 Lyx support ver 1.7 on cygwin with windows XP Professional
I am new to this program so excuse any silly questions
I cannot load .png images to display in lyx window, it informs me that there is error converting to loadable format trying to invoke view dvi gives message no information for converting from png to eps but using view pdflatex works fine.
Q1. what can i do to rectify this?
Q2.eps files are huge for my sort of graphics , what would anyone suggest as eps 2 high resolution png in this forum for use with lyx?
Q3.with the new windows version where the imagemagick has been removed do I need to install the windows version of imagemagick?

It works fine with .eps ,.jpg,.gif although i get b/w out put in yap it is fine to review my document and authoring purposes

Q4. can one insert .cgm files, at present i am just inserting them in powerpoint and printing to acrodist to get eps for use in lyx

many thanks

vivek