My friend screwed up my resolution.

Title says it all. All I can find on Google is complicated techie explanations for how to force the resolution the way I want it. Can I have a non-complicated explanation for how to fix this problem?Thanks for answers.

My friend did this to me and I found out it was zoom.
Just press zoom on the monkey wrench.

As it turns out, I discovered that I didn't evaluate all my options. Thanks for trying to help me though.@mods: You can please lock this now.