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General Computer Support / 'Blocky' closure of individual windows

« on: March 06, 2013, 04:15:50 am »

When I close, or minimise, a window of any program or file, there is a flash as if the window has closed normally, but then the window closes in a series of four or five blocks starting from the top of the screen.  All the desk top icons disappear until the window has fully closed and then reappear.  I cannot open any other window or program for about 10 seconds after clicking to close or minimise the first window.

Not a desperate problem, but very annoying and frustrating.  Would appreciate any help, preferably not too tecky!!