Computer keeps freezing

For some reason my computer keeps freezing every 5 mins for about 20 seconds then just started working again. Like I will be watching something or on the net then it just freezes nothing moves then it starts up and every command that I put in starts working.  It just started doing this morning.

Perhaps you could give us some info about your pc?

I hear some imaging utility from Norton will freeze your pc while doing the imaging. And it images periodically.