It sounds to me that when you are selecting 'Extend' or 'Clone' Windows is
applying the same desktop resolution to both monitors, hence the incorrect
size on the external screen. As I do not have two monitors connected at the
moment, this is coming from memory, and will also depend on your graphics driver
software, but here goes...
Windows does allow independent configuration of resolutions on monitors,
though sometimes it can be hard to work out which screen you are changing.
As your laptop screen looks ok, I will assume the incorrect resolution is
being applied to the external screen. On the display options (right click
desktop->Personalize->Display Settings) you will have a panel that will show
graphical representations of the two monitors, your laptop screen will most
likely be number 1 and the monitor number 2. Though it is not obvious, the
options below (resolution etc) apply the the screen that is currently
selected above, so first click on the number 2 screen, then select the
correct native resolution from the options below, click apply and this
*should* solve your problem.
If not then I would guess the third-party control panel provided my your
graphics card manufacturer is overriding these settings, you'll have to give
me more info if this is the case.
> I have a Dell 9300 with an attached Acer AL2251W 22" Wide Screen Monitor,
> with Vista Ultimate.
> When I first installed it I could see the complete window, then over a week
> ago I lost about 2 inches from the right side of the monitor.
> I then downloaded the Vista Drivers for the Monitor that I downloaded from
> the Acer Website. This did not resolve the issue.
> Now what is wierd, is I created another profile on my machine, this new user
> was to troubleshoot another issue I am having. Well when I first logged into
> the new user, the Monitor displayed correctly, no unusable black bar on the
> right side. But when it asked me how to handle the monitor (display the same
> desktop or extend) I chose extend and I gained the missing space again. I
> tried creating another user and this time selected keep the same view and
> same thing. I created another user and tried canceling the selection and
> again I gained the black bar.
> Now if I lower the resolution it works fine, but it is setup and is optimal
> for 1680 x 1050.
> Any Ideas? I can not find anything on the web about this, and it is strange
> that when I first login into a new user it works correctly until the display
> properties come up???
> Thanks for you time.