|if the TV has VGA input, you should be able to run a single cable from the PC to the TV, then you just need to use the TV remote to scroll through INPUT options until you get to something like Computer/PC/VGA.|
This does not address your desire to display on the PC monitor AND the TV at the same time. Did you want to have the SAME image, replicated twice? That's easy, you just need a cheap VGA splitter to plug into the video card. That'll give you 2 VGA outputs from the PC instead of just one, but the image on both screens will be the same.
If what you're trying to do is use the TV as a SECOND monitor, you may need more hardware. To process 2 different images simultaneously, Windows usually needs 2 graphical processing units (typically on your motherboard or video card), and most PCs only have one.