My iMac and Netgear Router from Sky Broadband are having problems

Hi, I've got a fair amount of knowledge in these area's. I not long switched to Sky Broadband a couple of weeks ago. The problem lies with the connection to the router that they supply for their service, a Netgear DG834GT. The problem is that my connection to the 802.11g network is extremely slow.
My iMac, even tested in the same room shows 20-30% signal. This compared 2 a Windows Vista laptop at 5bars and top speed downstairs, and two PC's (XP) either end of the house with the same normal signal quality.
Contacting Sky Broadband, they assume that the fault is with the iMac and are state that they can't really help because I am not using a wireless adapter supplied by them (If it's even compatible).
Does anyone know the solution to this? I've heard of many other users with similar problems on different Mac's but no-one seems to have a fix.
Also running bootcamp, ive found my signal strenth to me maximum, but my speed to still remain at 22Mb/s peak, and roughly 1-2Mb/s when browsing the internet.
Lastly I have WPA-PSK enabled, and i've tried adjusting wireless channels without having any luck improving the signal. I would be gratefull if anyone knew any ways to fix this problem, thanks
IMAC INTEL CORE 2 DUO   Mac OS X (10.4.8)   1GB RAM, 256 RADEON X1600

Buy the Wireless N adapter from Apple and install it. Even though the only specified effect is adding the N router capability, it fixes the problem you mentioned (worked like a charm for my friend).
Chuck
eMac   Mac OS X (10.4.8)   1.42Ghz PPC G4

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