Process "diskmountnotify" takes over the computer

Hi:
I am having a problem that I really don't understand and I hope that someone can help me understand better - and fix!
I don't know exactly when it started, probably within the past week or two, my Mac has been running very slowly, especially when coming back from a long period of inactivity (It doesn't sleep, but I let the screen go dark).
By slowly, I mean that any click can take up to 2-3 minutes to respond (e.g. activating an application, bringing a window to the front, etc.). Eventually (after about 5-10 minutes, it gets better to a point where is is reasonable, but still sluggish.
I looked at Activity Monitor, which shows that a process called "diskmountnotify" is taking between 96-99% of the CPU, which I have to guess is the reason.
The first thing I don't know is what diskmountnotify does. I can guess based on it's name, but, while I have some external disks mounted plus one AFP server volume, nothing is newly mounted.
The second thing I don't know is how to diagnose what's causing it to hog the CPU.
And last, I have no idea of where to start to fix it.
Any help, advice or direction would be very much appreciated!!
Thanks,
--Jeff

Michael:
Thank you!
Well, it turns out that the "Open Files and Ports" tab doesn't exist for that process, but a spotlight search shows that the path is:
/Library/Application Support/Norton Solutions Support/Norton AntiVirus
which means it's a Norton process. I've had many norton processes hog CPU before, so this doesn't shock me.
The parent process is "WindowServer" if that helps.
Any advice is helpful, but I will contact Norton tech support also.
Thanks for your help!
--Jeff

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