Try changing screen res at install boot start, press "F3" key when you start the LiveCD... at the screen you get to choose what kernel version you are going to use, press the "F3" key and choose a lower res setting, looks like you have a 15" mon, and old too. I'd try 800 x 600 screen res and see if that helps.
Or try a more modern screen.
NH
edit; these links may help
Installing Mepis on old hardware
Install MEPIS 
