Verified answer

You need internet service, plain and simple. Unless you have a neighbor with an unsecured network that you could leach off it (don't be a wanker though), you can't get internet. WiFi is internet that is only available in certain areas or businesses, like coffee shops. So if you want your desktop to get internet, you'd have to drag it all the way down to a coffee shop and hook it up there. Sound ridiculous? It's because it is. Also, you won't be able to get wifi on your ps3 without the internet, as I said before. Bottom line, go out and get some kind of decent internet service (DSL at the very least).

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-Also, how can i set up wifi on my PS3, when i have a router and not an internet connection?

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That should work fine. As for all your other questions, pawdres2k3 covered them fully. You don't need an Internet connection for your LAN or WLAN to be functional though. So you could certainly do local filesharing between machines on your network, share printers, access NAS devices, stream multimedia, play multiplayer games locally, and do anything else you want via LAN or WLAN even if you don't have an Internet connection.

For WiFi, you'll need an 802.11x NIC in your computer. You won't need to buy anything else since you already have the wireless router. You can use WiFi all you want without an Internet connection. It will work fine.

ok the other 2 people were right, but it may seem a little confusing. in layman's terms you need to buy internet. when you purchase internet from a company (at&t, Time warner, etc) you will they will send you a thing called a modem, its a box that you plug your phone line, or cable line into, then you will plug the modem into your router with an ethernet cable (the company you purchase the internet from should give you, but they are only like 3 bucks at walmart). when the router has internet plugged into it, it is able to send the internet throughout your house wirelessly (also called wifi). after you have the router sending out wifi signals you are then able to connect to the internet with your ps3 and computer. so here are the steps: 1. buy internet/get modem, 2. connect modem to the router using an ethernet cable, 3. connect ps3/computer to router using wifi