Windows XP x64 guest NIC driver?

[JeProject]

EDIT: From another thread "AFAIK there is no PCNet FAST-III driver for 64bit Windows". Ok nevermind! That explains it.
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I've installed WindowsXP x64 Professional as a guest running on a Windows 7 Home Premium x64 Host.
The Guest is saying it can't find a driver for the Ethernet Controller which is showing in Other Devices in Device Manager.
I see no mention of having to download a driver manually myself, and I don't know what NIC VB emulates, or if I can even install the genuine driver or if it's a customized one. It just seems to work for everyone else using this Guest OS. I got bridged networking to work fine with WinXP Pro x86 so I don't think it's a setup issue, just lacking a driver.

I've installed the Guest Editions 3.2.8 and am using the same version of VirtualBox.
Thanks in advance, I'll go back to running WinXP Pro for now.

[JeProject]

Realised I had to shutdown the Guest in order to change the emulated network card... Duh...

Sorry for pointless post!

[BillG]

Yep. Just like a physical machine!