Hi Richard,
Are you running a screen resolution of 800x600?
The site is designed to run in a minimum screen resolution of 1024x768 on your standard square monitor. I don't believe there are any monitors still alive that have a native resolution on the old 800x600.
If you are running your monitor in 800x600 on a flat panel monitor (or CRT) to compensate for size (insert your own joke here) you are probably also suffering from eye strain do to the distorted/fuzzy quality of your screen.
Image:Native-resolution 800x600 on 1024x768.JPG - Wikipedia, the free encyclopedia
To increase your size and still run in your monitors native resolution try the following.
1) (for windows) Right click on your desktop and select "Properties". Click on "Appearance" and increase your font size.
2) (for windows) Right click on your desktop and select "Properties". Click on "Settings", "Advanced" and increase your "DPI" setting.
Depending on your graphics card the steps may be a little different.
Let me know if that works for you.
On pages that sometimes run off the screen when the rest of the site is OK then you will find there is a long link URL or graphic that can not be wrapped and is pushing it off the screen.