Sorry to bring back up an old post but I have a related problem. First off, my 9860 does the same thing.....kinda. I was traveling a lot and when I was on the road I would connect to the hotels wireless and it would be fine for a while, then drop the connection. I had to right click on the wireless connection in the tray then:
view available wireless networks/change advanced settings/wireless networks (tab)/Use windows to configure my wireless network settings
I would always have to recheck the "Use windows to configure my wireless network settings" box!! After doing that, it worked fine until I restarted the system, then I have to recheck that box.
This brings me to my related problem, I'll set things up in windows only to have them revert to a setting like it's a default setting. Even for my video card! I'll set the card up to a "fixed aspect" setting and I have to do it for every restart. Does anyone know a fix for this? I am set up as an administrator but I'm not really great with XP.