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My previous setup:
Cablevision cable modem, D-Link DI-624 wireless router, WEP enabled. (upstairs)
Windows XP Desktop (Ziggy), RealTek wireless network card. (downstairs)
Windows XP Desktop (Dracolich), wired ethernet to router (upstairs)
Windows XP Laptop, built in IBM Thinkpad wireless card

Everything worked fine, no issues.

New setup:
Fios actiontec MI414-WR modem/wireless router, WEP enabled. (upstairs)
Windows XP Desktop (Ziggy), RealTek wireless network card. (downstairs)
Windows XP Desktop (Dracolich), wired ethernet to router (upstairs)
Windows XP Laptop, built in IBM Thinkpad wireless card

I.e. the only thing that changed is my modem and router were swapped for the new Fios combined unit. Hence, the SSID and WEP key changed. but otherwise, everything is identical.

Problem:
Ziggy now connects, with excellent signal strength, but the speed starts at 54Mbps and drops almost instantly down to 24, 5.5, 2, then 1Mbps and stays there. Performance is terrible. The Laptop has no issues, even right on top of Ziggy, so it's not a signal problem.

I've tried:
disabling WEP (Ziggy would just connect and disconnect over and over)
turning off 802.1x authentication (was never on actually)
rebooting Ziggy and the modem
disconnecting and reconnecting several times.
Verizon's Wireless Connection Wizard (was stumped)
Set channel to a few different settings (1,2,3)

Any ideas?

Hello and welcome to the forum gonzoron,
I'll mark this thread as "Open" for one of our techs to look at someone will be along soon

Hi gonzoron,

Sorry for delay in getting to your thread. Thank-you for detailing the troubleshooting you have already tried it makes things a lot easier.

Even though you have tried changing the channel on the wireless router your problem could still be caused by interference from another wireless network. The range on the realtek adapter may be better than the notebooks so therefore it may be picking up interference where the notebook wont.

You stated above that you have already tried changing the wireless channel on the router from 1 to 2. You need to change the channel by atleast 4-5 as the frequencies overlap. If your router was originally set on channel 1 try changing it to 6 or 10.

If that doesn't help the problem then I would recommend you get a new wireless adapter for the problem pc. My personal preference is Netgear but Linksys or Dlink wireless adapters are also very good.