You should of installed 3.55 ofw first, infact try that now, installing a normal fw, maybe that will work Or try getting a new hdd, Its probably your hdd that has failed, yes hdd's can fail from any time, so check it's your hdd or not. I've never experienced this, so I'm just telling you what i know. Hope you fix this problem soon. And remember to backup for the future so if stuff like this happens you can just revert back