Downgrading kernel in FC4

[patrick]

I'm wondering what is the proper procedure to downgrade the kernel
(and perhaps other packages) in FC4? I have a computer with a VIA
chipset, and the latest kernel causes the computer to freeze up after
about a day or so of playing MP3 files straight. At first I thought it
might be player software itself, so I replaced mpg321 with mplayer,
but the same thing still happens. I suspect it is either an upgraded
kernel or alsa-lib that's to blame, as this problem didn't happen
prior to a "yum update".

Thanks,

Patrick