Why is my background being invaded by this blue stuff?

[Guest Confused Traveler]

Sometimes when I move my mouse over my applications, they just decide to turn blue for no reason. I don't know why and I've tried to clear my cache and other stuff with my AVG software like updating my drives. Whenever I use the cursor select feature using the left or right click this weird blue stuff also appears and lingers wherever I move my selection box. Sometimes the entire screen will turn blue at once while clicking around and sometimes my cursor selection inverts and instead wherever I use cursor selection the blue background turns normal again, I have no idea why this is happening an

 

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