Startup Repair has worked for me after I had to do the same as the OP ;-)
--
Jane, not plain
64 bit enabled
Batteries not included. Braincell on vacation :-)
"Max" <Max@nomail.com> wrote in message
news:ORTL4QK8GHA.4288@TK2MSFTNGP02.phx.gbl...
> You over-wrote some necessary boot files that Vista installed and used on
> your XP partition (in a dual-boot scenario). So Vista no longer exists in
> the boot sequence. You will have to re-install Vista so that it can
> re-write this information.
> You could first TRY booting from the Vista media, and doing a "repair
> start-up", but I really don't know if this will help in your
> situation--maybe somebody else knows.
> PS. when setting up a dual boot, it is almost always imperative to install
> the newest OS last.
>
> --
> Maxwell Bluemeanie
> "marc.nutty" <marcnutty@discussions.microsoft.com> wrote in message
> news:C2A237B9-86D4-4B82-A3E1-7DE9C581BF25@microsoft.com...
>> Hi,
>>
>> A week ago I had XP and Vista on seperate HDDs (using a dual-boot setup).
>> This weekend I decided to format XP HDD and install clean XP again.
>> (needed
>> doing). However, now when I boot up my machine, it automatically loads XP
>> with no options. Vista still exists on the seperate HDD. I've also
>> arranged
>> boot-up preferences > CD/DVD then > HDD etc... (in same order as before).
>