Windows selected without clicking in Windows 7

  DerekL 00:18 27 Sep 10

I am using Windows 7 and recently every time I hover over a Window without clicking it is selected but does not come to the front, which I don't mind so much except when I click on the hidden icons in the task bar and I move the cursor up to select an icon, the hidden icons window keeps disappearing and I cannot select an icon.
Has anybody got any ideas please

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