LMM - if your TV and Computer have HDMI ports - you would just need a HDMI Cable (we got ours online pretty cheap - it's a 15 footer)
Our 46 in. tv we have the cable plugged in to the 2nd port - it's called HDMI 2 on the screen settings.
On the computer, RIGHT CLICK on your desktop so you see a menu like
VIEW
SORT BY
REFRESH
PASTE
PASTE SHORTCUT
UNDO MOVE
and a few lines below that you should see
SCREEN RESOLUTION
(You must have the TV turned ON - and set to your HDMI setting channel)
When you click the Screen Resolution the third setting down - should say something like
ORIENTATION
Click that - and you SHOULD have the option to "EXTEND THIS DISPLAY"
that will bring up your TV like a 2nd computer monitor and still allow you to use your computer while streaming stuff to the TV
*hope that's not TOO confusing! LOL