@gothrek For some reason (or bad luck) your SHARE partition is corrupted, you can connect your HD to another computer and try to fix the errors through windows, maybe it works.
Otherwise, you need to try to access your SHARE partition from another computer (or a Linux Live CD for example), back up, and re-install.
I do not know any other options, if none of this is resolved, the HD is corrupted in an irrecoverable way.