What are your system spec's?
...more to the point, which graphic's card do you have?
Might well be as simple as a driver update for your graphics card..
Have you tried that? 
as to your problem, if you could post your graphic card, current ram, etc. that also might be helpful..I know that i had to wait around a month or two for a new graphic driver after installing vista, as the manufacturer didnt come out with one until march
AMD atlhlon xp 64 processor 3200+ 1.2gb Ram
Okay ...the graphics card is around the medium range. It should do the job, but it may not be coping with that particular dream file, or it's possibly [as I said earlier] as simple as a driver update.
Have you tried others yet, to verify that it's possibly just that file?
If you need to update drivers for the card, the latest for your card were released on August 13, and you can get them here http://ati.amd.com/support/drivers/vista32/common-vista32.html
Install, reboot, then try your dream files again.
Good luck.
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