My desktop pc runs Windows XP. Lately I've noticed that when I try to shut down my PC it gets to the final shutdown screen and then stops. At first I thought it was just sorting itself out, and if I left it for a few minutes it would rectify itself. But , this doesn't happen. I have to turn off my PC by pressing the main button on the console. Could this be a problem with the hardware or software. Any help appreciated. Many thanks.