|Randomly moving a magnet around a CRT will usually mess up the colors quite nicely.|
Many CRT monitors have a degauss button or automatically degauss on every start. If the monitor has a row of buttons at the bottom look for a degauss button.
Could be you are using the wrong resolution and/ or refresh rate for the monitor.
Using Truetype fonts may also help. Could be the monitor has just past its prime and needs to be put to pasture.