In what qualifies as our most unusual support call of the year, we just got a call (from a staff member’s son as it happens), who reported that his cat had just jumped on his PC keyboard, causing the Internet Explorer toolbars to disappear.
The answer is that the cat accidentally put IE in full screen mode. Using F11 gets is back to normal.
There are plenty of anti-virus packages on the market, but I wonder if anyone sells an anti-cat package?