I found this thread using google. I get this same error. Vista Home 32bit, not sure if it's premium or not (it's my wife's computer and I am at work).The error code that I get is: "WindowsUpdate_80070002" "WindowsUpdate_dt000"
I tried the AU Check, it ran and didn't seem to make any changes.
I went to the M$ website and it was registered with windows genuine advantage.
I went to update.microsoft.com and it gave an explanation page how windows update is builtin and loaded the windows update from the control panel.
I disabled antivirus and any other process that I knew didn't need to run.
I tried installing the standalone version of Service Pack 1. It got ~70% through then failed.
This is a laptop only used at home, Dell XPS 1330. I'm kinda afraid that the problem might be due to proprietary Dell crap installed on the computer, or Dell drivers or something.
Anyway, I think i've exhausted all the suggested made in this thread. Am I stuck with reimaging the drive and hoping it installs then (in which case it wouldn't be the dell software/drivers) or is there more I can try? I'd prefer to not image if I can avoid it, as my wife has a ton of stuff that would need backed up.