Ethernet not working on recent Mac and Boot Camp

Hello,
it turns out that the default ethernet driver installed with the Boot Camp utilities is not compatible with my mid-2010 iMac (Broadcom 5701 according to System Profiler). The driver is deactivated in the devices panel of Win 7 and no update is available.
The default driver, according to Broadcom (http://www.broadcom.com/support/ethernet_nic/netxtreme_desktop.php) doesn't work with Win 7 & a 5701 card, so I should install the XP/2k3 version.
Too bad there's no understandable way to do so, even if the driver is supposedly available on that site (there's no installer in the zip package). I don't know if I'm missing something, I'm not a Win user.
Did anyone manage to get ethernet working on a Sandy Bridge Mac, Boot Camp and Windows 7?

difool wrote:
And they are Sandy Bridge Macs with Broadcom driver 14.4.2.2 (b70nd60s.sys)? Is the driver correctly enabled? Are you using just the default windows update application or did you perform any manual install?
Thank you for your reply
I did nothing beyond installing the Windows Support Software, all the machines are new (purchased within the last 10 days)

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