This sounds like Video Drivers so I would look for an update.
Try turning AERO off to see if that solves your problem. You can
also turn Transparency Off as a check.
"varlien" <varlien@discussions.microsoft.com> wrote in message
news:542F9C61-3939-40C3-9F6D-04E65E93861A@microsoft.com...
> hi every,
>
> im running a vista premium, and recently ive noticed that my taskbar is
> acting weird.
> 1 - the taskbar thumbnail preview works, but it doesnt minimize after i
> move
> the mouse away from it
> 2 - there is a problem highlighting the current running windows (the blue
> shadow highlighting). like for example, when i switch between windows
> using
> the alt+tab, or when i switch manually, buy clicking on the window header
> without clicking on the taskbar, the highlight remains on the previous
> window...
>
> please help!!!
> 