Spent the better part of three weeks trying to figure out why this PC randomly would freeze up forcing a necessary hard reboot. Turns out the "HP Recommended" Power plan was the default setting.  I changed this to "High Performance" and modified a couple WHAT POWER BUTTONS DO plan settings (i.e. turned OFF Fast Start Up & Sleep in the SHUTDOWN SETTINGS section.  Do this by UNCHECKING them.)  I also deleted all temp & prefetch files.  (To do this, in the "Type here to search" box type %temp%.  Hit enter.  Now select all files & delete them.  Then type "prefetch" (without the quotes).  Hit enter twice.  Select all the files and delete them.  Reboot.  And you should be good to go.  My PC has not frozen even once in over 10 days now!  NOTE:  Its probably a good thing to delete temp and prefetch files on a regular basis to keep things running fast & smooth!  Good Luck & Enjoy!