converting .dmg file to .iso

http://www.crystalidea.com/anytoiso free version successfully converts .dmg files to .iso, but there is a 850MB limit on file size.
http://www.winarchiver.com/ can be used for larger files..

mac os on windows pc using virtual box

Here is a great article showing steps to run mac os on a windows pc using virtual box: http://www.lifehacker.com.au/2012/08/how-to-run-mac-os-x-on-any-windows-pc-using-virtualbox/

The key idea is enter boot with HackBoot ISO, then change virtual CD to hacked Mountain Lion ISO and press F5 to be able to see it..