Word Documents Acting Weird


Lately, when I am working in Word (Word for X for Mac), an odd thing happens. The lines on the screen get squished together so that they overlap or sometimes Word duplicates sections several times over on the screen. This doesn't seem to go away when I scrool up of down to make the screen refresh or when I toggle to another document or application. I'm working on a G4 (350 MZ), with 640 MB of RAM and running OS 10.2.8. I'm not sure about this but this may happen more when I have multiple documents open.
I know that sometimes when I've been advised to do stuff like trash .plists, some other problems have gone away, but I don't feel comfortable trashing files without advice.