Problem Mountig

There are three partitions on my disk:
1. win98
2. win98
2. linux ext2
When the knoppix loads, this is the fstab file:
# Added by KNOPPIX
/dev/hda1 /mnt/hda1 auto noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hda3 /mnt/hda3 auto noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hda4 /mnt/hda4 auto noauto,users,exec 0 0
But when i try to mount any of the partition, the following message apears:
"Could no determine filesystem type and none was specified"
If I change the fstab to this:
# Added by KNOPPIX
/dev/hda1 /mnt/hda1 vfat noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hda3 /mnt/hda3 vfat noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hda4 /mnt/hda4 ext2 noauto,users,exec 0 0
The message that appears is the following: "Wrong fs or to many things mounted".

How can i solve this?

Thanks
Tomas Zulberti