I could also be hda3. Did you try that one? (Red Hat used to, and may still, create a /boot filesystem that it, well, boots from. This was to avoid the 1024 cylinder BIOS bug. I'd guess that that's what your hda3 is, but I can't tell from just that.)

Were you able to get Linux to boot directly? If you tried both hda3 and hda4 as the bootable partition and neither one worked, then you're going to have to reload your boot loader. This is not quite as difficult as it sounds, and isn't all that uncommon, as Windows likes to overwrite it.

But it's kinda involved, so let's get a response to the above before I get into it.