Hi OneOfOne. At the risk of turning this into a saga, I'd have to say that your hardware is probably not at fault. I would still recommend that you check settings. You are running a mixed net, XP and Vista. These OS's do not do networking (wireless or otherwise) in the same ways and therefore make the job of communicating that much more, interesting! I run a mixed net at home with 2 XP boxes and Vista laptop. I have recently changed address and used a local service provider at my old address. My old ISP don't provide service at my new address so I switched to BigPond (Big Mistake) I originally used the modem that Bigpond provided (complete rubbish). My laptop saw the change in the network that came with the new modem and Vista being Vista completely reconfigured its networking, blocking out my desktop and my F&P server. Even though it worked OK, the Bigpond modem operated with settings proprietary to Bigpond. I replaced the modem, no change. I disabled and reset all networking on my systems, and after some frustration everything now works OK. I have gone through this process with some 20 other people, all with similar symptoms and all ending up OK. Thats not to say yours is the same problem, but, a new modem/router costs money, reseting you network parameters doesn't.
Cheers
ed