It's quite normal for the CPU meters to spike in Windows. They've done that for years. And as the drives retry due to old age, well that's discussed.
I don't see anything malicious going on here. HUM AND BUZZ are mechanical issues that you solve by replacing the thing that makes the noise or tieing it down.
I have a Dell Inspiron 531S desktop . . it's *always peaking at/near 100. I imagine that's what makes it hum/buzz.
*I need to know what to do about it.* I don't have money, I had a Thoracic Aortic Aneurysm last Jan. and haven't worked since.
A guy at Best Buy said that there's probably something malicious running in the background to make it do that. There aren't any programs running in the task manager and he said that the Processes are all unrelated . . to a possible cause.
The browser I use is Cometbird, I do have IE9 installed. The system was sold with Vista Basic, it now has 7 Premium. (32 bit) It's been working with Microsoft Security Essentials for at least a year.. something different before that. I have System Mechanic 11.5 Professional on it. I downloaded Sophos' free rootkit removal tool - nothing.