Pentesting a WEP-protected wifi network

Hello list,

I am currenty trying to pentest a wireless network protected with WEP
(not sure if 40/64 or 104/128 bit).

I would like to know what are the best tools to use if the equipment I
have for the pentest is an XP workstation with a 802.11b D-link
wireless card.

I know there are many tools for Unix / Linux with certain wifi cards,
but I would like to prove if it is feasible to break a WEP key with
just an XP and any wifi card.

Thanks in advance for your help and best regards,
Rodrigo.

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