Kids changed display size?

Hello,

At some point yesterday the kids were playing an online video game.  Now any printing on a website that I try to view is very small.  My monitor is a 19".  I tried to resize to 800x600 pixels, but that made everything too large.  At 1024x760 pixels everything is still too small.  Is there any happy medium between these two settings?  Or, is there a way to restore the factory default settings which were working very well until yesterday?

 

Many thanks for your help...