Hacked just now...how to prevent in the future?

I was sitting at my computer this morning when my mouse started moving. My airport was turned on. I turned it off and disconnected my computer from the ethernet cable. Right now the a
Currently, my cable runs directly from the wall to the Comcast modem, and from the comcast modem to my computer via ethernet.
Do I still run the risk of being hacked if my airport is off? What are some additional precautions I can take? Is there a utility I can check to see who is logged on to my network? Sorry for all the questions, but also, can someone hack my computer if it is completely off, and what about if it is on, but not logged on?
Thanks for answers to any of these questions!

What about if I am logged on, but do not have wireless or ethernet plugged in?
Assuming that your machine is "clean," then no. If your machine was "hacked," with, let's say, a keylogger, then still no, because the hacker would have to have access to your computer to gain from the hack.
Also, what are your thoughts on Intego's NetBarrier or similar products? Are these just novelties, or will they really keep someone out?
Although products like these can potentially enhance your Internet-venturing security, they offer little beyond what just enabling WPA2 encryption already does. One advantage that this type of product does offer is outbound firewall protection, something neither the AirPort Extreme or the OS X firewall provide. The importance of outbound protection is it will let you know if your computer has already been infected and is trying "to call home." This is definitely a problem for PCs. I've yet to see this with Macs.

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