Finding a Disappearing Application in Windows?

siuengr asks: "I have a computer that has a window that pops up every few minutes, but disappears before I can figure out what it is. I have run every virus program and spybot cleaner I have, but they do not find any problems. How can I figure what is causing this window to pop-up all the time, when it doesn't stick around long enough to see anything about it? Is there any software that tracks what applications have ran over a period of time, even if they are not currently running?"