Wireless PC Card (802.11b router) for my older Dell Laptop

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  I have a very old Dell Notebook (PII-363Mhz) with WinXP (Pro) on it
and I am unable to use it to connect to a Netgear MR 814 (802.11b) DSL
router as the Wireless USB Adapter (Netgear MA111)
(http://www.netgear.com/products/details/MA111.php?view =) and other
PCMCIA cards available in the market (like MA 521, MA 311 (from
Netgear))recommend usage for Laptops with speeds over 400 mhz.
Can you kindly let me know where I can find Wireless PC cards for the
dell laptop to connect to a 802.11 b router?
Thanks very much for your kind help

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