This may be a problem others have had, but I've looked everywhere and haven't been able to find a good answer, yet. I'm dealing with a few bugs.
The first bug relates to alt-tab. When I hold alt and press tab, the pop-up with previews of each active window appears as it should, however after about a half a second, it disappears. In that half a second, I can quickly alt-tab from the active window to the one directly behind it, and if I hold tab, it quickly cycles through all the others with the pop-up staying up, but the minute I let go of tab for the first time, the pop-up disappears and nothing happens.
I have a similar problem with my taskbar. The Aero theme includes the great feature of hovering the mouse over the icon for an open program to show a small preview of that window (or all the windows in a given application). When I do this, the preview pops up breifly, but then quickly disappears as well. If I move my mouse slowly across the icon, each time the mouse stops, the preview refreshes, but the preview disappears when I try to move my mouse over it to, for example, select one Word document out of 3 that I'm working on.
A related bug to this may be that when I try to click-drag to reorder the icons on my taskbar, the click-drag only "grabs" the icon for a half a second before releasing it (even though my mouse is still down) back to where it originally came from.
I'm running Windows 7 Professional 64-bit on a refurbished Alienware M17X that I received from Dell a few weeks ago (in replacement of a dead Inspiron 1720... go figure how they made THAT decision!). Any help would be much appreciated. I will gladly try to take screenshots or record video if any of my explanations were unclear.