Since upgrading to windows 10 on my Dell Inspiron 600 I have had this extremely annoying flashing black box appear in the upper left hand corner of the screen which occurs about once a minute for just a moment. I have downloaded all of the recommended Dell updates for my computer but the problem continues. I thought it might be the graphic driver but when I tried to download a different graphic from the DELL website it advised me that the version on my computer was a newer one. Windows update center also says I'm up to date in all areas.
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