Every minute or so the cursor on the screen flicks to the hourglass, for just a fraction of a second, and than back to the cursor. This happens when the cursor is left still. I don't have a screen saver on, I scan for viruses, run adaware and spybot every other day, so no problems detected. The os is windows xp pro. Two IBM computers are connected to a linkus router, the main computer has a P4 2.4g processor and it is the one watched most and has this hour glass thingy. Any comments, suggestions?