My computer hesitates every few seconds, and sometimes it's worse than other times. There are also times when it doesn't really hesitate much at all. By "hesitate", I mean it freezes for a split second. For example, any sound, no matter from where, would sound like it was skipping, like a bad CD. Video hesitates as well, as do YouTube videos, text cursors, and everything else.
I know it's not CPU usage, spyware, or too many programs running. Restarting the computer temporarily fixes it, but not for long.
What's going on, and how do I fix it?