computer freezes every few seconds

About every 2 seconds, my computer freezes for about the same length of time. During the freeze, a small horizontal bar appears near the top of the screen and goes away while the computer functions as normally. Furthermore, there are several vertical stripes along my screen at all times, and when I have certain things open, such as when I first on my computer, the screen will be pink. Furthermore, the blue screen at log in will also be strangely tinted, and sometimes I notice a small white patch growing from the bottom left corner during the freezes which disappears after the freeze. This white patch only seems to appear on the Window's starting screen. Furthermore, sometimes, I can see a few things from the program I previously had open. For example, when I log in, I can still see the users screen somewhat.

via Bleeping Computer Last 20 Posts http://www.bleepingcomputer.com/forums/t/512059/computer-freezes-every-few-seconds/