Slow Connection with WPA

I have a Dell Inspiron 1505 with a Dell 1390 WLAN Mini-Card. The laptop is running Windows XP Pro (SP2) with all the latest patches. When I connect to my wireless network with WPA encryption, the connection is extremly slow. I get less than 1mbps. With WEP (or no encryption), the connection is normal.

I have two other laptops (a Dell 600m and a Dell 1000) that do not have this problems - and never did. Both of the older laptops use Dell wireless adapters. I've tried two different routers (Netgear WGT624 and Linksys WRT54G) upgraded to the latest firmware with the same results. I've spoken to Dell, Netgear, and Linksys. They all point the blame to the other company.

Does anyone have any idea as to why this might be happening? Is there a Windows something that may be causing this?

I'm desperate! Please help!

Thank you!

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