kernel panic during RPMing a kernel update

[Axel]

Hello
I m using Fedora 7 Test 2. Two kernels are installed : 2.6.20-1.2981 and
2982. The 2982 doesn't boot, there is an oops during boot. So I
continued to use the 2981. From time to time, kernel freezes, so I
wanted to update to the 2987 version.

The problem is that during the install, I get another crash. At reboot,
there s still 2981 & 2982 kernels in grub menu, but rpm -qa | grep
kernel tells me that 2987 is installed.

What is the best to "clean" the system, and to reinstall the 2987
kernel ?

Thanks in advance.
Axel