As far as changing the font size in the main menu bar, this can be done through the Windows Control Panel, but any changes will be universal - they'll apply to all applications.
Finding the options to change the menu font and size is kind of complicated, but here's how I do it: Open the Control Panel and select Personalization
, then down at the bottom click on Window Color
. In the next window that opens, click on Advanced Appearance Settings...
to open the Window Color and Appearance
window. Click on the menu item Normal
and select your preferred font and size, then click Apply
to check it out. Hit OK
when you're done, save your theme if you want, and you're all set.