If you have Internet Explorer open then you should possibly have a blue (or coloured) bar across the top of the page roughly describing what you are watching and below that there should be a Menu bar showing "File, Edit, View, Favourites, Tools and Help".
Click on the VIEW in the menu bar to alter the TEXT size.
If you do not have the menu bar showing then RIGHT click on the first row after the blue bar and the Tool bar panel should appear showing "Standard buttons, Address bar, Links".
Click on the Standard Button line so that a tick appears along side of it and the Menu bar should also appear just beneath the top blue bar.
See how you go.