It is not because it is beta for sure.
The system realized that video subsystem uses too much resources, it is
either a bug somewhere or gpu issues
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"dimitris_greece" <firstname.lastname@example.org> wrote in
> I have the following configuration
> CPU Amd X2 4200
> RAM 2GB in dual channel configuration
> Nvidia 6800 ULTRA
> When I use multiple windows in windows vista beta 2 I get the following
> "would you like to disable desktop composition ? "
> why this message appears ? because its beta or i don't have a good gpu ?