Hello,
I've installed the psgreek font in MiKTeX 2.8 since I need to write a few greek words. Everything works fine as long as I don't change the default font. However, I have to use a sans serif font as default in my document. I'm changing the font with:
As soon as I add that line the greek font looks ugly in the resulting PDF file (I can see the pixels). You can use the following example to reproduce the problem: