Computer hacked? accidentally in someone's network?

look so Im new to macs, so having grown up on PCs I'm not sure what else to think of this.
I went to youtube.com and instead of being logged into my account, it was "belfortie" some other person. I'm leaching off of someone else's wireless, could I be hooked into their actual "network?"
at the time I was also downloading videos from users, (when I was installing one, a WMV file, my mac said that the file "may contain an application").
sorry long winded. I'd appreciate any help. I'm so lost
(also firefox quit working and keeps looking like its gone into "no style" mode. dont even get me started on that...)
Message was edited by: crywolf

YouTube - sounds like some prior YouTube'r accessed from your computer (nothing to do with network, nor Apple vs PC) and left their ID in a cookie on your computer. When you get to YouTube, look for an option to "Sign out" or "Log off" or something like that, and then sign back in with your User-ID.
Firefox - Are you sure you're not getting into the default Apple browser, Safari? Safari is initially the default browser, so if that's not been changed, any application that invokes web browsing will bring up Safari by default. There's a place in Safari preferences (Cmd-,) to select which browser is the default. I've been using Firefox for a while and haven't had a problem, other than what I just described.
"May contain an application" is a general warning to you that the file MAY have some suspicious malware (aka virus) content. Unless you have reason to be suspicious dismiss it and ignore. I don't believe a .wmv file should be contain an application but those files could well be hiding a Windows virus of some sort - good news is, unless you're running in Windows on your Mac, the virus won't function so you're safe. Another of the joys of Apples.
Leaching wireless access - in today's world, if someone is running an unprotected wireless net, I'd think they're okay with sharing and not worry about it. However, that leaves open the possibility that other person can access the contents of your computer. Be sure your Firewall is turned on in the Sharing control panel and File Sharing is turned off, and that you have set a password on your user Account. (And I figure it's inappropriate for anyone here to remark about what you might or might not be downloading.)
Don't give up on Apples, it truly is a better way!

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