I am running a dual boot system with both Fedora Core 4 And WinXP Pro and had been for a while when one day, booting to linux, all of the dameons failed to start. I rebooted and got a grub command line, so i put in a knoppix CD, and it wont mount my FC4 Root partition. It mounts my home partition fine, and it is the same file system, so i figure that i have corrupted the filesystem on my root partition. Are there any good (preferably soft) ways to recover it? Or should i just reformat and reinstall?

Perhaps you can check out fsck.
I am not really good at using this command so you had better check out the manpage before trying it.
Or search for it in these forums.

no good...

==
root@2[knoppix]# /sbin/fsck.ext3 /dev/hdb1
e2fsck 1.37 (21-Mar-2005)
/sbin/fsck.ext3: Filesystem revision too high while trying to open /dev/hdb1
The filesystem revision is apparently too high for this version of e2fsck.
(Or the filesystem superblock is corrupt)


The superblock could not be read or does not describe a correct ext2
filesystem. If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
==
but i know the syntax is right, because it works on my ext3 home partition:
root@2[knoppix]# /sbin/fsck.ext3 /dev/hdb4
e2fsck 1.37 (21-Mar-2005)
/home: clean, 26779/5217280 files, 990322/5217108 blocks
root@2[knoppix]#