small fonts.

I'm not sure if this is allowed here, but I want to ask:

I'm using PS CS3 for quite a while & I recently just installed some new fonts. However when I try to use them, ALL OF MY FONTS at size 20 or so, appear very tiny [Note: They are NOT pixel fonts.].
The only thing I can do to make them visible is to increase the size to 800 & above.
I'm wondering what I can do to solve this problem, because when I installed my fonts like I did in PS Elements, the fonts works perfectly well :/

Thanks in advance.