OK, you can upgrade to a later kernel 2.6.12.18 is the latest released using the mandriva repositories.
Make sure you have set up your easyurpmi repositories (using easyurpmi link at top of this page), I add them all - main, contrib, jpackage, updates, plf-free and plf-nonfree. Then just:
CODE
urpmi kernel-2.6.12.18mdk
reboot, and your system will then be running the newly installed kernel. Later, if you want to remove the old one:
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urpme kernel-2.6.12.12mdk
and that will remove the old one, just don't do this until you've made sure your system boots correctly with 2.6.12.18.