netsh int ip reset reset.log
netsh winsock reset catalog
winsockfix "what is it and what does it do?"
It'd be too long story to explain every single command, but, if you're really curious, you can simply Google one command after another.
In general, all those steps restore various network settings to their defaults.
ATF Cleaner cleans all kind of garbage from your computer, mostly temporary files.
Autoruns shows you every single program, every single process, every single driver running on your computer.
You can open Autoruns, and explore all its tabs.
For instance, "Login" tab shows you all startups - all programs loading, when your computer starts.
How to read it?
That's a long story. You need a mix of some patience, some computer knowledge, and good help from Google, so you don't disable something, what will screw your computer up.
It's like with everything else. You won't learn it overnight, but eventually, you'll, if you have a will to learn.
Visiting, and reading boards like this one is one of the best ways to do it.