Windows 7 Atheros Wireless Driver help.

i have a atheros ar9281 wireless card and in windows 7 it works perfect with my iphone and ad hoc. but in my vista it doesnt. i realised the driver for the windows 7 it says
Driver Provider: Microsoft
Driver Date: 11/7/2008
Driver Version:
Digital Signer: Microsoft Windows

an my vista says
Driver Provider: Atheros
Driver Date: 13/01/2009
Driver Version:
Digital Signer: not digitally signed

how can i get this windows 7 driver foy my vista. also to not my vista is 64bit an win7 is 32.. cud that be why the drivers are different.

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