I'm having a strange problem where after a short-time after I reboot, any window that I minimize or close in Windows XP sp2 remains visible but frozen (like they become part of the wallpaper).
They do not show in the Task Manager. It’s like Windows is not repainting whatever was behind them or cleaning them up.
If I do a ctrl-alt-del and come back, they clear-up. The desktop icons also vanish. I have to reboot to get it all working again.