Has anyone/everyone here with this "XP bug" tried to resolve the freezing issues by turning down/turning off shadows? (either via the launcher or via .ini?)
Shadows are set to Low on mine. In fact, because of the CPU drain, it's the only setting I've reduced. I have everything else set to Ultra and it runs very smoothly. When I raise the Shadow level, the result is persistent lag, totally different from the intermittent freezing. Since the shadows look as poor as they do on high settings, I consider it no big loss.
I think a few people have suggested that this could be a distant terrain rendering issue. On one occasion, I was approaching the lake west of Riverwood and noticed that an island in the lake looked very odd, like a flat 'V shaped' mass. As I approached, the game did its usual 5-second freeze act, then the moment it recovered the 'V' resolved into a regular-looking island. Coincidence maybe? Or maybe whatever it was doing to 'fix' the island caused the prolonged stutter.
Thankfully, I've now learned that I can alt-tab out of Skyrim as long as I have another window open, so I'm making it standard practice to open something before I start the game. Haven't run into another crash yet, so I don't know if the previously suggested alt-tab fix will correct those for me. But thanks for the tip regardless! If that gets me past the crashes, this will become a much more bearable problem. Still annoying when the freezes are going every 30-60 seconds, though.