Windows ruler window - Shift-R Annoyance

Periodically, I'll be typing as fast as possible (i.e., wearing out the backspace key), and suddenly Windows decides I've summoned the following window. What causes this?

Some folks think it's caused by the IE7 web developer toolbar. Try disabling it to see if that helps. (A temporary measure - you'll probably need the toolbar for some other IE7 problem soon enough).

(Google: the window says "Ruler Snap to X/Y Axis Hide Tick Marks Snap to Element Hide Endpoints Hold down the Crtl key down to create multiple rules. Ctrl-M shows/hides the window magnifier.")

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