ITunes on iMac with USB g/b wifi adapter won't detect other Apple devices

Hi guys
I have an iMac 20" running OSX 10.6 (latest version) from about 2006 which the built-in wifi adapter broke on so I now use a USB wifi g/b adapter which works fine for connecting to our wifi router/modem.
The problem I have is that my other apple devices, an iPhone 4, my old iPhone 3G and my 2nd gen Apple TV cannot connect to my computer. My iPhone and Apple TV connect to each other with no problem at all.
I am wondering whether the fact that the USB wifi adapter on my iMac only runs g/b and not n is likely to be the cause. If anyone knows if this is the case or has any other suggestions I would appreciate it very much as I'd really like to use content from my iMac on my Apple TV.
Many thanks
Neil

I suggest you post over in the correct -> iMac forum or the Snow Leopard - networking forum

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