My creative zen keeps freezing!
I know this response is way late to help you, but I was having the same problem. I could turn the zen on fine, but as soon as I tried to play music it would freeze and I couldn't turn it off. Using the reset button didn't help any since it would still freeze if I tried to play anything.
But I found reformatting the entire zen totally fixed it.
Connect your zen to your computer, go to windows explorer, click computer on the side bar, and your zen should be under "portable devices". Click on it. You should now be viewing the "storage media". Right click and select "Format...". This completely resets the zen, clearing any preferences or media you put on it and the freezing problem.
It was annoying putting all the pictures, videos, and itunes back onto my zen, but at least it works now. Since I've reformatted it, I have had no problems.
Hopefully this helps others who experience this problem.