How do I get everything bigger?!

Hi. I was recently sharing my computer with my mother, and she needed verything big. So when she didn’t need it anymore, I went to change the screen resolution back, but it was either to large or to big, not how it was normally. Now I skrewed it to the point where the text of everything and the icons on my toolbar(taskbar?) are all WAY to friggin small. Can anyone help me out here? I’ll settle with any size now as long as it’s bigger.

Thanks
Kaiios