Hello Wisdom of Arrse My PC has recently developed a 'tic' - there is a tiny freeze in the beat rate of the computer so that about every second or so the computer freezes for a millisecond. Best way to spot it is by moving the mouse pointer in gentle circles and you can see it stop briefly. Any ideas what's wrong? It's no problem for work but a pain for movie playback and games. Dell Precision 690 with hodloads of memory and processing power, running Vista 64 Ultimate. Thanks!