I'll tell ya what, I'll try to help ya on this one too.
Okay, let's take this from the top. I'm gonna start simple. Firstly, are you running AV? If you're running an Antivirus program, and Windows Firewall, you should be good to go. I wouldn't worry about locking down your machine any more than that (i.e: I'd suggest getting rid of the Online Armor firewall).
It sounds to me like the issue isn't your desktop, but your wireless connection. Do you have any other machines in your house that connect to the wireless? If not, I would try hard wiring your machine, and see if it works.
SVCHost is a "shell" that contains a lot of running processes. It's why there's so many instances of it. I wouldn't worry about it connecting to the network.
With your final question, are you asking this with the intent to shut off non-needed services? If so, what's your goal in doing that?
I'm sorry I ask so many questions, but the more information I get from you, the easier it becomes to formulate an answer.