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 combed the web for solutions and tried the following:
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)
Verizon's Fios optimizer (says it optimized the connection, but the problem persists)
Set channel to a few different settings (1,2,3,6,11)
Unplugged my 2.4MHz phone in the next room
moved all wires away from Ziggy's antenna
updated Ziggy's network card drivers
So far the best result was from switching the channel setting to 11, but that only worked for an hour or so, then it was back to the same problem.
The PC worked in the same location with my D-Link router exactly where the actiontec router is now.
The Laptop works now right on top of the problem PC.
The only thing that changed in the wireless setup is the router.
Any ideas? Help!