Hi,
I noticed that every time that I open a window related to the sytem ( eg: Windows update ) the computer takes a snapshot of it. How I found out this is quite queer :
I opened Microsoft Word and I wanted do scroll down the document. So I clicked the mouse wheel and move the mouse down so the pages moved down slowly. When I clicked the mouse wheel button I noticed that instead of the appearing of up-down arrows, a square with a piece of image appeared. Without moving the mouse ( if so it disappears ) I clicked elsewhere and another square relating to the same image appeared. It didn't take me so long to realise that it was the image of my desktop while I had a printing session going on.
To test the temporary image I opened Paint and saw that the paste button was false, then I viewed the desktop and pressed the print screen button. Then I resumed to paint and clicked paste. Then image appeared there. Then I went back to the word document and did the clicking thing and spaces of my desktop appeared.
I don't know whether this is truly a spy infection or whether windows or any other application takes snapshots.
Tharaka
PS : My log files are with SpybotSandra, for that case my PC is suspected for an autorun infection.