It is actually really confusing, the point of cloud 9 is that it is online and you can access your files from anywhere. Hopefully you can use cloud 9 in that way. If not spend a bit of time getting familiar with nodejs on windows. Install some simple programs and try to use them. Then try the following commands, but I have been using them on a ubuntu linux machine so they may not work as well on windows.
git clone https://github.com/c9/core.git c9sdk
It is a bit more tricky to get apache2 working on your home machine, check the site to see what I had to do.
ignore the bash file b01-on-your-computer.sh as that automates loading a dockerfile on your machine.
Good luck this is not beginner stuff.
So I tried it on windows and it does not work, (windows does not like the sudo command and a .sh bash file does not work, you need a .bat file, even changing .sh to .bat runs it but other commands are not recognized) you could probably do the whole docker install on windows but that is even more complex (and a huge download).
Sorry. This is probably not very helpful but ubuntu is a reasonably easy install on an old laptop http://www.ubuntu.com/download/desktop
but this is why I switched to cloud9 online since I don’t have to keep installing ubuntu on old machines.