Other firewall software?

Hi,
I have a new imac (very impressive!) and have just switched from pc's. I want to share files, itunes, etc, but when i try to do this through the appropriate system prefs page I am told I have another firewall software running on my computer and can't get in to turn the OSX firewall on or off or change settings. So far as I know i have not added any firewall software. I do have ClamXav and MacScan running. Can anyone help me? How do I find out what this other firewall is and turn it off so I can change my prefs and share files across my home network?
Thanks in anticipation for your help!

Open the Terminal application in the /Applications/Utilities/ folder and enter 'sudo ipfw flush' without the quote marks. If it still doesn't work, choose Go to Folder from the Finder's Go menu, enter /Library/Preferences/ as the folder's location, drag the file com.apple.sharing.firewall or com.apple.sharing.firewall.plist to the desktop, and restart the computer.
(13060)

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I recently turned on the built-in firewall on my MacBook Pro. Ever since doing so, every time a run iTunes, get the following message:
[quote]
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[/quote]
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Welcome to the world of Mac - I hope you will like it here
I came from the Windows world some years ago and have never regretted the switch - on the contrary. I love the ease of use, stability and security of OS X.
There are a lot of opinions regarding whether you should use antivirus and/or third party firewall on a Mac.
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http://www.clamxav.com/
http://www.intego.com/
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