Have a look at this thread;
http://forums.techarena.in/showthread.php?t=708148
Particularly this post;
<quote>
I too was having the same problem with my laptop and an external monitor. Whenever I logged in,
my display settings would get all get reset.
I tried disabling the Windows event log as suggested and that corrected the monitor issue, but
had some other unintended consequences. By disabling the event log, the Windows Task Scheduler
also becomes disabled, thus any applications dependent on the Task Scheduler won't run.
After further research I found the root cause of the dual monitor problem. There is a task in
the task scheduler called TMM (Microsoft Transient Multi-Monitor Manager). I disabled this
task, and all seems to work fine now.
</quote>
Do not disable the Event Log, but try going into Task Scheduler and
disabling TMM (Microsoft Transient Multi-Monitor Manager).
That seems to have worked for me, too.
This has been just another very annoying Vista bug.
-Michael
* -kds:
> I too am having the same problem! Does anyone know how to fix it? I'm not sure if it's my
> new dell laptop, my new samsung monitor, or vista premium????
>
> Help please, this is really annoying!
>
> -K
>
> "David Barrett-Hague" wrote:
>
>> I use my Dell Latitude (D830 with Vista Business) laptop with an extra monitor when in the
>> office. I extend my desktop to the left but occasionally, but not all the time, when the
>> laptop sleeps or I return to the office after using my laptop remotely it has swapped
>> places and is now on the right.
>>
>> I don't want to rearrange my office so does anyone know how I can retain the second
>> monitor position?
>>
>> Regards Dave
>>