i need alot of help

ok, i have a dell xps computer, and a 17’’ dell monitor that came with it. i am buying logitech speakers. i need help basically turning this into what would basically my tv, so i can watch tv,( i just have regular old cable, the one with about 60 channels lol). i also want to be able to play my xbox 360 and nintendo wii on it. can someone please tell me everything i will need to do this.

bump

Get something like this: AVerMedia AVerTVHD MCE A180 HDTV PCI Card (White Box) MTVHDA18 at TigerDirect.com

Or, if you don’t want to open your PC;
KWorld Xpert DVD Maker USB 2.0 Video Capture Device VS-USB2800 at TigerDirect.com