I'm no expert by any means, and hopefully someone more experienced will chime in to either support or refute my recommendation here....
In my experience, if there's a problem at the mounting section of the boot process, it frequently is the result of a mangled /etc/fstab file.
You can boot off the Mandriva install disk and then use the rescue console to examine this file and compare it to what you see when you type 'lsparts' in the console. Somehow it seems like it's trying to use a non-swap formatted partition as swap. Hope this helps,
di11rod
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