MacBook Pro shows up twice under Shared in finder sidebar once as PC

This just started today. I have my iMac and MacBook Pro networked through Airport Extreme. Today my MacBook Pro shows up twice under my iMac finder sidebar. First icon is itself (MacBook), second icon is PC. Both with the same name. Get info shows the second icon as PC Server. I cannot connect to the PC icon, which I'm assuming is a good thing.
Why would this suddenly happen, and how do I get rid of it? I've restarted airport, repaired permissions on both machines. Checked to be sure that only AFP is check under File Sharing on both. Network preference pane WINS shows no servers connected on Airport or Ethernet, etc.
Anyone?
Appreciate any help with this. I'm definitely not a networking expert

Ok, ive had this problem for ages and i think ive pretty much figured it out, your computer is showing your macbook over your network and through Bonjour (apples own wireless connection) Still not sure why it always shows it as a PC though, or as a server...
Anyway, I ive found where it originated from, if you go to System Preferences>Sharing, at the top you will see your computers name and underneath it will say "Computers on your local network can access your computer at:" and its name will be whatever the 'PC server' is called on your finder sidebar, in your case "tosha". You can test it by changing the name to something like "tosha1" by clicking the edit button, in may cases the extra shared computer will disappear, but, after a while it will reappear and will now have the new name. =[
Sadly I dont know how to stop this but I suggest you take screenshots and go to an apple store, tell them about the problem and hopefully they will have an answer for you, they know everything! And even if they dont, check their machines to see if they have the problem, and if they dont, look at the settings and try and find why.
Im sorry I cant be of much help but im getting closer to the bottom of this and im sure its linked to bonjour! Ill keep you posted if anything else happens!
p.s. Im not a networking expert either! Im just as stumped as everyone else!

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