First off, welcome to Windows 8 Forums.
Overclocking Failed? Heh happens to me all the time.
You are probably going to have to do a fresh install. I see it FAILED, it gave you a Blue Screen during Boot.
Well, from what I can see, it is only giving you ONE option: You can RESET your PC, which means it will delete everything, possibly even your User Documents and Data.
Before you do anything else, download Hiren's Boot CD, if you can- Make it happen use a friends computer if you have to. You can burn it to disk or copy it onto a Flash Drive, there are steps you can take to do that but I won't go into it now, just get the ISO image. After you get it and make a Disk from the ISO, Scan your hard drive using "Dos Programs - Hard Drive Tools - GWscan". Just make sure the drive is ok, right?
After you have checked your drive, you can boot to Mini-XP - NAW, we don't wanna be paid dude, ahahaha! Look just hang tight, let me see what I can do here. Boot to Mini-XP and run a full CHKDSK on the drive, this is just for safety's sake.
After you have done all that, reboot to Hiren's and use Mini-XP, it's in the menu just click the down arrow until it is Highlighted. It should boot your system and now you can access your drive. Connect a USB drive or even connect another hard drive to the system if you can and COPY all of your important data! Because from what I am seeing here, you WILL have to reformat the disk, so the most important things is going through all of your folders one by one and saving anything you need.
Once you've backed up what you absolutely need, and I am urging you not to rush this, take as much time as is needed- You can use the Partition Wizard which is in Mini-XP to delete your partition. Just delete it.
You should then be able to do a fresh install of Windows 8, it will ask you how you want to format your drive, or it may do it automatically, you should probably just let it go Automatically.
After you get Windows 8 back in, don't try to downgrade it again. Hopefully, all your Docs and files will be able to be copied back on the system drive.
Don't worry - This has happened to me a dozen times and I've used Hiren's to access my data and move it to a safe place.
The only other thing you can do it open your system, take the hard drive OUT, connect it to another system and copy your files that way.
Now I know this is not what you wanted to hear, but all I'm concerned with is getting you able to save your important files. Hiren's is probably the best way you can do this, for the situation you are in.
Keep us posted on your progress. Programs can be re-installed, but once Windows "resets" and it deletes your personal data, well, it's GONE. So you will have to manually back it all up.