Why slow wireless download Macbook Pro Bootcamp Xp Leopard

Problem: wireless download speed is much slower running windows Xp on a macbook pro (bootcamp) than when running OS X. Example OS X = 1,164 KB/sec download, 496 upload vs Xp = 265 KB/sec download, 940 KB/sec upload.
I have a Macbook Pro Duo Core running OS X 10.5 with the newest Boot camp drivers for windows installed. Test was done using Speakeasy speed test, Safari/Explorer 7.
funny how only the download speed is slow under Xp, not the upload speed.
thanks for any help,
Paul

Here's a solution that worked for me, my chipset is a Broadcom 802.11n (4328). It's a 24" iMac (Pre Alu).
Hopefully it helps others. Broadcom have updated WHQL drivers (picked mine up from here, they have Vista versions on there too) and it was just a case of installing those and changing 2 settings.
Changing IBSS mode to 802.11a/b/g/n Auto:
http://img220.imageshack.us/my.php?image=configip9.png
Setting the Rate (802.11b/g) to 54:
http://img411.imageshack.us/my.php?image=54gmodeei7.png
Now my speed is on par with Leopard

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