It looks like this has happened a couple of times before, with "large" drives of the time. I bet that there's something more than usually wrong with the hard drive and fsck needs more memory than usual. Let's try adding more swap space and see what happens:

Code:
mkswap /dev/hda2
swapon /dev/hda2
fsck -fay /dev/hda4

ISTR that you don't have a second drive, but if you do, and those steps didn't work, also try this:

Code:
mkswap /dev/hdb6
mkswap /dev/hdb2
swapon /dev/hdb6
swapon /dev/hdb2
fsck -fay /dev/hda4

That should add more swap space than I could possibly imagine that you need.
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Bitt Faulk