Rookie here...need help with black screen/arrow cursor issue

I have a little computer competency....not a lot. Here is the issue:

I have a Dell desktop Intel Pentium Inspiron 530S, fwiw.

A couple of days ago, I did a Windows Update and noticed that the fonts on several websites, notably this one and Facebook, had changed. On this site, I could barely read what I was typing due to the font change. I decided to then go in and change my Windows restore point to an update from a few days earlier. When I did this, all I have gotten since on reboot is the black screen with the arrow. I have tried safe mode to no avail. I'm at a loss. Any free ideas?