A box on my screen interfering with operation

There appears intermittently on my screen a blue box that looks like part of some HP tool.  It says "audio adjust,"  followed by 2 lines that are alternately highlighted: "volume" and "mute."  I can't remove or minimuze or move this box.  When it is present, many apps freeze and force rebooting.  Presence of this box is intermittent.  Presently it is constant, and survives rebooting.  Norton Utilities has been unable to find it.

Check your monitor buttons - one could be stuck.
Which monitor do you have?
Have it speakers?
Do you have a hdmi connection from pc to monitor?
*** Say 'Thanks' with Kudos ***

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    How to back up your devices using iCloud or iTunes - Apple Support
    Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support
    Re-download or transfer your iTunes Store purchases from an iPhone, iPad or iPod to a computer - Apple Support
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