To get decent photos of your TV, then you just need to use a slow shutter speed (this prevents seeing the scan bands), unfortunately, this may be impossible with a point and shoot camera.
If you mean from your PC, then press shift and Print Screen, then open something like paint and Ctrl and V to paste it into the program. I use a program called Snagit, which does everything including resizing and adding captions though instead of the Print Screen command. See attached desktop capture.
If its of your PC just press "print screen" then paste into a graphics program like Photoshop or paint. That will take the whole screen, if you press ALT+ Print Screen it will only take a screenshot of the current active window.
If you want to take a screenshot of something like a DVD or TV viewer that might not work, in which case a program like snagit might.
EDIT: I can't type fast at this time in the morning...
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+