Use this test card to optimise your monitor's display:
http://reeddesign.co.uk/testcard.htm
You need to be able to clearly see all of the numbers, from 0 to 10, on both of the relevant lines. If you can't follow the instructions to adjust your display.
It's also important to optimise the text display on your monitor:
Click 'Start'
Type 'cleartype' into the box.
Click on 'Adjust Cleartype Text'
Check that there's a tick shown there, enabling Cleartype.
Click 'Next' and choose the text that looks best to you.
Repeat until completed.