I was diagnosing a problem with Aero and previews of open windows (taskbar) and came across this message.
The Desktop Window Manager is experiencing heavy resource contention.
Scenario: The Desktop Window Manager responsiveness has degraded.
I did a system restore to an earler time, installed a different driver
. It's when 2D surround is on that previews aren't working. They did work at one time.
My video cards are two GTX580's in SLI.