problem with e2fsck

When I run e2fsck, I get the following message:

>  Parallelizing fsck version 0.5b (14-Feb-95)
>  e2fsck 0.5b, 14-Feb-95 for EXT2 FS 0.5b, 95/03/19
>  Warning: Inode table 751557 for group 90 not in group.
>  WARNING: SEVERE DATA LOSS POSSIBLE.
>  Continue<y>? yes
> 
>  /dev/hda4 contains a filesystem with errors, check forced.
>  Pass 1: Checking inodes, blocks, and sizes
>  Relocating group 90's inode table to 751557...
>  Restarting e2fsck from the beginning...

At this point it repeats the same message, in a seemingly infinite loop.

If I try to mount the partition, I get this message:

>  mount: wrong fs type or bad superblock on /dev/hda4

I tried using fsck with other superblocks on the partition, but I get the same
result.

Any suggestions would be appreciated!