Laptop? Desktop? New computer with Vista preinstalled? Old computer with Vista upgraded?

Which programs are showing issues? Microsoft Word, Microsoft Works, OpenOffice, Wordpad, Notepad, something else?

"I am having trouble when I type, or for that matter any printed matter." But at the end you state: "However when I print a document, it
seems to print fine." So does everything print correctly but it's simply the screen that displays things wrong? If so, have you visited the computer manufacturer, or video card manufacturer's website and downloaded, then installed the latest graphics driver for your machine? If not, try it.

If it appears to be a monitor issue, have you tried simply switching the monitor to a known "good" monitor and see if that fixes it?

Hope this helps and let us know more.