TC backups causing Internet Problems

I have a 1TB TC connected to a Netgear Wireless Router that is connected to the WAN port of my Comcast Cable Modem. The NetGear's wireless is disabled so that it is only functioning as a DHCP server and gig-switch on the network. All devices on the switch (including the TC) can communicate with the Internet fine...
Until I run a backup FROM A COMPUTER ON THE SWITCH. Devices on the TC seem to have priority and backup without an issue and don't experience any problems. Devices on the switch, however begin dropping packets...about 50-80% drop rate to where connecting through the gateway to the internet is almost impossible. This only happens when a backup is running across the Netgear. As soon as I stop the backup from my MBP, the switches connection becomes stable again.
Does this sound like a faulty switch (perhaps my Netgear can't handle the load) or a problem with the TC? I only suspect the TC because of all the other issues people have had with dropping connections...
Also, does anyone know if TC is using some type of packet prioritization through the router for backups? It almost seems as if all the available bandwidth on the switches ports are being chewed up by the TC backup from my MBP.

Hi,
Hi!
That is realy a unique situation.
Yes it is, I agree. But we have no other choice here unless it's dial up.
When i understand you right, so then is:
Antenna -> Cable -> Modem -> Cable -> Airport
and on the same Modem is also a Cable to your Imac
Is this correct?
Not quite, let me clarifiy.
Ok, if I do a direct hookup to my computer, its antenna->cable->modem->cable->computer. That gives me internet to only one computer.
If I use the airport express it's antenna->cable->modem->cable->router->and cables from the router go to: Imac, eMac, and airport express.
which mode you set on the Airport? Specialy, what you set on the question about your Internet >Configuration?
Umm...I don't remember and I can't figure out how to find out without resetting it but I have some good news. I reset it earlier because I remembered that the apple customer service person had me put in some apple DNS server numbers which have nothing to do with my server's so I reset it and manually put in my server's DNS numbers and it's working pretty well since then so I have my fingers crossed.
No, then it's not a loop.
Good, I didn't think it was.
Ah.. another question -> The Antenna on the roof -> it is also a Wifi-Connection to your provider?
The antenna on the roof was installed and paid for when I signed up with my provider and it belongs to them. They invented the system. It is my only connection to my provider.
Greetings from the swiss alps
Wow!!! Thank you! Are you having lots of snow? What is your altitude!!!
Martha

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