Issues with connecting iMac wirelessly to a Netgear router

The iMac in question being a 2.66GHz model bought in August 2009 running OSX 10.6.6, and the Netgear Router being a DG834GT. The iMac is being exceptionally temperamental when it comes to connecting to the wireless network. Strangely enough there are times when it will connect fine, but most of the time it will either connect for a minute or so and then drop, or just not connect. When the latter happens it seems like it is giving a different error message every time, sometimes saying that a preferred network isn't available, sometimes saying that the password is wrong (when it isn't), sometimes that the ISP has failed (ISP is Orange) and so on. Even when it says it is connected Safari then seems to think it isn't.
We also have a MacBook Pro, an Xbox 360 and two Windows based laptops that have all never had a problem connecting to this router wirelessly. Yet the iMac, the most recent piece of technology by far, just can't seem to stomach it.
Is there something that can be fundamentally changed with the wireless settings that will fix this? Or, in fact, anything that will fix this?

Unfortunately we are already using WPA (which my MacBook Pro has no problems with), so nothing to change there.
Interestingly we have just called up Apple to see if they have any ideas for a quick fix, and they suggested wiring it up, which should somehow fix the wireless aspect of it as well. So after carefully moving the iMac and stringing some wires into fairly dangerous positions, it is now wired up. However, upon disconnecting the wire it worked for all of thirty seconds wirelessly before cutting out again. However, I do recall in my mind something about connecting a Mac via a wire first and then fiddling with something to help it work wirelessly? I don't know what that is though, so suggestions are appreciated.
In the very short term connecting it via a wire works, but really a solution needs to be found asap. If the wireless issue can't be sorted I expect I will have to invest in a very long ethernet cable and run it from the router to the iMac, which whilst obviously not ideal is certainly possible.

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