What wireless network adapters will work? Windows 7 compatibility pages say that the Linksys WUSB54G is compatible but Windows 7 says the driver is not compatible.

Linksys says the WUSB600N is compatible but I have not bought one yet.

Is what I have compatible but I need another step?  What does Dell recommend we use for wireless connectivity to a Vostro 220 running Windows 7?  I had assumed that what I had would work, as it worked with XP, but I guess not.