When I want to re-size a screen, I just hold my left CTRL key down and roll my mouse wheel forward to increase the size or backwards to decrease the size. It works fine in XP and may (or may not) work in Win-7.
Well, give it a try anyway. (what can it hurt?)
WELL, I'm a retired PC tech but still work whenever I'm called out to fix something or install a new PC.
Most all my customers are OLD as me or older. Weak eyes and cataracts are the norm. I even have a few folks with Macular Degeneration.
I regularly get customers who complain "my emails are in such small type, I can't read them".
When I show them how to make the type bigger, just using their mouse, they just go ape!
It's like, "WOW, GEE, That's so COOL!".
I now show that trick to all my customers, over 65 or not.
There's hardly a day goes by that I don't have to use that trick on some email, or web page.