Hey thanks liamgood :)!
So your computer is 100% stable?
Can you please just go through the steps again that you followed to get rid of Driveguard? Also, how did you upgrade to Windows 8.1? Mine was done remotely by Microsoft Estonia because the laptop's anti-theft device wouldn't allow me past it when I tried from the Windows Store.
Then, did you get all of the HP driver updates as well? If so, how - each file from the HP site, or via the HP Support Assistant? And the AMD graphics driver? What version do you use? Did you have all users intact after the upgrade?
What browser do you use - Chrome or IE 11 or other? Does it matter?