My wife has an HP p6228p desktop. It has an Athlon II X4 620 2.8 gig processor, 8 gigs of RAM and a 583 gig hard drive. It originally came with Windows 7 but it upgraded to 10 about 2 months ago. She's having a weird problem. There are times when the Windows button and the volume control work as they should. Then there are other times when she has to right click the Windows button and access the menu just to shut down or bring up the sound mixed to adjust the volume. Rebooting has no effect. Am I missing a setting I'm not aware of or is there a ghost in the machine?