As I click to access Finder, I notice that there is something new. In particular, there is a computer (PC) under the "Shared" area. When I click on it, it says "connection has failed" with an option to "connect as." Yet I have no idea whose computer this can be; it sure isn't mine. I bought a Macbook last week, yet this pops up as a PC. My question is: have I been hacked, or is someone trying to, and, most importantly, how can I remove this computer from my shared list? Your help is greatly appreciated. Thanks!