you don't need the installation cd dude. Do what I suggested a couple of posts ago. Connect the router to the vmng300, connect your pc to the router and turn everything off. Turn the vmng300 on first and wait for all the lights to go solid, turn your router on and then your pc.
When your pc has booted up click on start, type cmd, hit enter, type ipconfig and hit enter. Don't worry if you cant get on the internet, if your router is handing out information properly you'll see your ip address as something like 192.168.1.100 with a default gateway of 192.168.1.1. If your ip address is 169.254.whatever then you are screwed.
Forget the installation cd, you can configure everything on the router by going to 192.168.1.1 like I said earlier. You can do that without it even being attached to the modem. The problem you have got is that once you have used the modem with it being directly attached to your pc/laptop, you need to reboot it when you connect it to another device (i.e. your router) before it will work again.
I strongly suggest you spend some time trying to work this out because you want to try and keep using your vmng300 as long as you can and avoid using the shub at all costs.
It is a shame you can't get an internet connection so you can do a remote assistance request and I can sort it all out for you
