it tells you to use no less than 75.
This would really only be applicable to a CRT, not to a TFT / LCD display.
If you plug in an external CRT monitor and install the correct drivers (if Vista doesn't), then you would have the ability to adjust the refresh rate to a more ergonomic 85 or more.
You may find it beneficial to change the screen DPI setting from Normal (96 DPI) to Large (120 DPI). I believe that option is applicable to LCD screens as well as CRT.
Also, the screen clarity may be adjustable with "Clear Type" or font smoothing - turning these on or off to achieve the desired result.
For all these things you need to dig around the advanced settings in screen display and desktop settings.
SD