I see a lot of articles about this on google. But you also need to allow such on your router.
There's a lot of work for you to do here, but as there are so many good articles about this, why not use them?
I have a wireless laptop runing Vista. I have just bought a desktop PC wired to the router, running Windows 8.
What do I have to do to share files between them? They are on the same network as I can see each from the other but cannot access.