Some of that answer is in this article:
The update is not installed successfully, you receive a message, and the
computer restarts when you try to install an update in Windows Vista :
http://support.microsoft.com/kb/949358/en-us
The command prompt in the recovery screen of the boot disk should let you
have access.
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Mark L. Ferguson
..
"RCNut" <> wrote in message
news:7406FB16-B7F3-475D-94ED-...
> When a Vista system is unable to restart and all restore/fallback
> procedures
> have been unsuccessful, is there a way to create a stand-alone, bootable
> system that can view/modify/delete/replace Vista files on the Vista system
> disk. I received a hotfix #939331 for a fix for a Vista system that would
> not
> boot. However, the hotfix required a running Vista environment to be
> executed. This is a catch-22. How do I resolve this without
> restore/reinstallation of Vista?