I've been experiencing the very same problem on my HP EliteBook 840 G1 notebook. It all started when I've been using Win 7 x64 and the tech support had no answer for it. It continued after I upgraded to Win 8.1.
I did manage to solve it by using a fix on this page https://support2.microsoft.com/kb/2990029/en-us
I suggest you follow the procedure as explained in the "Workaround" section.
Please, let me know if it helped you, too.