Thanks for replies.
It is the same CS6 on the old acer laptop and the new Dell Inspiron laptop. Both laptops have same screen size 15.6".
Text on menu bar and size of left-hand tools icon bar, and info down right-hand side are "normal", i.e easy to read, on old laptop but very small and hard to read on new laptop.
I have gone into preferences and set text to LARGE but this is making no difference, even after restarting CS6.