Cliffro, it is your WIFI NIC giving you problemas for sure.
I'm using vista 64bits ultimate for 9 months now, my PC has an above the standart use .I'm playing cod, and ma Mrs is watching a movie at the same time, with Vuze, doing some print serving (ma Mrs is a devil multitasker, thus she got the right man, a geek) and some other process i have "hanged" here.
Pretty stable. I just restart it when a new version of Catalyst comes out. Driver issues are almost non existent now. Some old hardware might now work, but hey, that always happen on a new OS.