Hmmm... I have a wireless Belkin router on Vista 64. Don't remember the model number offhand, but it's a plain square box, all white, 802.11n, and has the three grey~ish antennas. Plus the usual blue lights on the front of the panel. I'm only using the wireless for the rest of the house though. Stuff like my laptop from work, printers, the wife's Mac and work laptop, etc... My own comp is plugged in, and for no other reason than I my 'office' is closest to where the cable comes into the house. {read this as: "The wife long ago banished me and all my crap to the corner of the basement next to the utility panels so she wouldn't have to look at it/me when she didn't feel like it...." I'm sure you single folks are laughing. Married guys know *exactly* what I mean.} Anyways...
In my case, Vista 64 successfully configured itself for the router on it's generic drivers and settings. It literally did it all in the background when I plugged in Lan cable. I use NetworkMagic for management since I like the pretty pictures and am lazy. Plus it notifies me if I have unwanted guests, and the like. And that works on the generic Vista drivers too. Since this combination was humming long without my "help" I applied the old "Don't Screw With What's Working" rule and didn't bother to install any specific drivers. Quite frankly I was relieved to not have to deal with the potential for endless troubles, and walked away actually thanking Microsoft for a change. In XP I would have at least had to configure the stuff, you know?
I have not tried to use a wireless connection from Vista 64 to the Router. So that might be the deal here. So if you can, try plugging into the Router from your V64 box sans manufacturer drivers, and see where that gets you.
enewmen: My understanding is that the starndard is well enough advanced that it's not (supposed to be) about the hardware any more. So a firmware flash should see you through. And to be honest, the N spec is supposed to be backward compatible anyhow.