The Windows fonts are sometimes replaced by random characters and numbers. The problem occurs due to the Lucida Grande font that ships with the Safari installer - it probably conflicts with your existing copy of Lucida Grande font for Windows.
Here's an easy fix for font issue:
- Open the Safari 3 installation folder (C:\Program Files\Safari)
- Double click the "Safari.resources" folder. You will see have two font files - Lucida Grande Bold.ttf and Lucida Grande.ttf.1.
- Either rename the files with some different extension or delete them completely from your system.
Restart Safari - everything should look perfect now. No greek or strange characters anymore in the UI.
Update: If the above trick doesn't solve your font display problems in Safari, here's another workaround that works for sure.