Ping has nothing to do with your computer and everything to do with your internet/where you live. I have no idea what 100 pct is.
What you did is adjusted your screen resolution. Right click on your desktop, select "Screen Resolution", then in the resolution drop down box pick the value that has (recommended) next to it. If that doesn't fix it, do whatever steps you originally did in reverse. It sounds like you disabled the Areo theme (or whatever it's called) and went back to Windows 98 theme in your quest for FPS.
Trying to increase your FPS just for the sake of having a higher FPS is about as useful as increasing the horsepower of a minivan. Considering you don't know the specs on your computer, it's hard to say if your friends actually have worse computers than you or not.