The poorly thought out feature HP added to their audio driver in some past models of laptops can now be removed. The previous driver listened for a certain key to be depressed actually recorded all keystrokes made by the user and stored the information in plain text under the Public profile.  The file was deleted each time the computer restarted but could still exist in backups, you should check for MicTray.log in those backups.  Slashdot reported this morning that HP has released a fixed driver which you should grab from Windows Update or HP.com immediately.

"HP says it has a fix for a flaw that caused a number of its PC models to keep a log of each keystroke a customer was entering. The issue, caused by problematic code in an audio driver, affected PC models from 2015 and 2016."

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