/etc/fstab should be read-only for normal users, and read-write for root. I hope you have some kind of boot disc, like perhaps the install cd to boot into. If so, once booted, open a terminal and do 'ls -l /etc/fstab' to see the r-w-x permissions and ownership. If the permissions are ok, then you should only need to su to root, and use vi to edit fstab. Then reboot without the cd.
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