DOS Fdisk won't see ext2 partitions on the extended partition. You'll have to use a different partition manager, ie. Linux fdisk, Partition Magic, ranish partition manager, etc.
If you want to re-install Mandrake 8.1 over Mandrake 8.1 you could do up upgrade, I think. This will leave everything intact though I'm not sure exactly what it will do! Or you could just re-install ...
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