In Windows 8.1
Open "HP Utility Center"
Click on “HP Support Assistant”.
Under “How would you like to receive updates and messages from HP?”
Click dropdown menu.
Select “Never check for updates or messages.”
Then click radio button for your choice regarding "Would you like to share anonymous usage data with hp"
Click NEXT
Clicking NEXT saves the setting.
This will not remove it but it should at least disable it.
Hope this helps.