IMac knocking out Router/Modem

I recently purchased a new 21.5 iMac 3.06 GHz running 10.6.2. Since the day I set it up last month, I have had issues with connecting with my wireless network at home. The issue I have is that when other machines are on the network simultaneously (both Mac and PC), I have no issues. Speeds are great, both upload and download. The minute I introduce the iMac to the network, the Mac performance is much slower, then ultimately takes down the whole network requiring rebooting both modem and wireless router.
I'm using a Netgear WGT624v2 wireless router. I have changed security settings, channels, "b" only, static IP address on both router and Mac, and nothing seems to resolve the issue.
I'm at a complete loss as to what to do at this point... This is definitely an issue between the Mac and the Router, since I was able to test the Mac on another network without issue. I'm reluctant to trash the router, since I've had no less than 10 different machines connect to the network at various times without issue. I know other are having similar problems with this connection problem, so any help would be appreciated.

Welcome to the Apple Discussions!
I would try a new configuration using dynamic routing by DHCP and a 40-bit WEP. Then start with the new iMac. If it does OK, add another computer to the LAN. Keep adding computers to see if the addition of one of them eventually brings it down. Or also. just the iMac and each one of the other computers individually to see if there is a conflict between the new iMac and just one of the other computers on the same LAN. At least you can get an idea if it is actually the router and the iMac or something else in the mix.
Dah•veed

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