When I start and use my WinXP SP2 system all is normal (as far as normal gets..hehe), and although it's not really a big problem, when I use alt-tab to cycle through the various windows open I always find an unidentified window/object in the list, and if I select it, it brings up a small grey box in the top left corner of my screen. There is no description of what it is, and the icon (in the list) is just a default window icon, i.e. a white box with a blue strip on top. Once it's there, i can't select or highlight it, move it or right-click it or anything, its just there. Again, it only appears after I use alt-tab.
I am completely baffled as to what it is, and can't find any info anywhere. I am usually upto tackling whatever goes on, and normally keep up with the usuall quirks one has to deal with on a regular basis, even fixing other people's pcs, but this has got me stumped!
Any ideas/help would be much appreciated, thanks...