Error "Windows DreamScene can't run as your desktop is now configu

I am running Vista Ultimate 64 and installed the Windows DreamScene
(Preview). I tried to run it, but recieved an error saying:

Windows DreamScene can't run as your desktop is now configured.
Windows DreamScene cannot run because the total desktop size exceeds the
primary video adapter's maximum texture size.

I have an ATI All In Wonder X800 XT video card that I'm running at 1600x1200
resolution ( http://ati.amd.com/products/radeonx800/specs.html ), 2.2GHz
AMD64 processor, and 1GB RAM.

Any idea on what I should do?

Thanks,

Robbie G

I posted the wrong specs link for my graphics card. Here's the correct one:
http://ati.amd.com/products/radeonx8...0xt/specs.html

Update: When I disable my second display (1024x768, composite video out to a
TV), DreamScene works.

I am getting the same error when I try and use dual monitors and the desktop
extended onto another monitor.

Windows DreamScene cannot run becuase the total desktop size exceeds
the primary video adapter's maximum texture size

DreamScene will only work with 1 monitor activated.

I am using an IBM Lenovo laptop Z61t, which has an intel chipset display
driver.

Any updates as to whether this will be fixed?