I have the same problem but my computer is new... less than a week.
I have a XPS 15 (L502X).
It's like it was a problem with the processor because the problem appended most of the time when i launch 3/4 programs with music and everything freezes for 1 seconde and the sound buzz.
Did someone try to reinstall a new clean Windows without anything? or someone contact the support?
Guess what guys? I've got an Alienware M17x with the same exact issue. I've been hung up on by Dell Alienware Support 4 times in a row now. Sure wish someone would figure this out, highly irritating.
I made a little test and my problem come with the processor. When the music buzz the CPU total go up to 100%. I don't have a lot of applications who is on.
Yeah, the same thing happened with my CPU. I've been trying to find exactly what is causing the spikes, but so far have been unsuccessful.
Also, looks like the problem isn't isolated with the Inspiron 1545.
Your CPU may be jumping due to another issue though. Hard to tell what the cause is, the CPU 100% is just an effect.
I ran the CPU Spike test, Mine only spikes at the Most 19%, on the bad one... mostly I get 3-6 of these stuttering, buzzing, clanking sounds per song. Makes me wonder if this is a CPU Problem, or a Motherboard one, I will continue to investigate this further, BEFORE I contact Dell, When I do, I have saved all board messages to forward to them, When I contact them, I bypass support and send the email to the Admin Part, it seems to get them jumping and acting quicker too.... stay in touch.
I as well am using McAfee, as it came with the laptop.
I have heard that it's a bit of a power hog, but I tried disabling it before and it didn't help. I haven't uninstalled it yet, though, so I might try that later.