There is a fix posted here that may help:
http://forums.techguy.org/windows-vi...iguration.html
--
Jane, not plain

64 bit enabled :-)
Batteries not included. Braincell on vacation ;-)
MVP - Windows Shell/User
"Aymincendiary" <zbar2005@yahoo.com> wrote in message
news:5F57908C-420D-40EE-9963-EA571BA30AE5@microsoft.com...
>
> --
> FAQ section tells how to set up multiboot but doesn't tell you how to
> clear
> a jam.
>
> When I install Vista on another partititon, I get a message at end of
> install:
>
> "Windows Cannot Upgrade Boot Configuration. Installation Cannot Proceed."
>
> If I install Vista on the main partition overwriting XP, I can install
> successfully. But then I lose Windows XP.
>
> Please let me know how to work around this OS limitation.
>
> Thanks!
>
> Chris