I need to do a slide presentation - lots of graphs and figures to about 40 people they do not have a projector, but have a 70cm TV screen to which I will connect my Laptop W7 64 bit)

I need to enlarge the power point slide to fill the entire laptop screen which will tfr like that to the TV - if not the lettering in the slide becomes illegible, and if retaine at normal size the slide is too small to use in this environment - must enlarge to full screen.Is this possible - if so please help
thank you