Ok - So it is not an activation issue - It is stuck on some point of the Automatic Repair task. I'm gonna give you a list of things to do, try to do em the best you can.
First - Download "Hiren's Boot CD"
Download Hiren
There are a number of utrilities on there you can use to check your hardware. What I want yua to do, is check your Hard Drive for Read Element Failure.
If you boot to the disk, you will see "Dos Programs" - Open those and you will see "Hard Drive Tools" - Look for "ViVard" - this is the best program to scan a drive for Read Element Failure. When the program comes up, you will choose your Boot drive, and then you will select "Drive Scan with Remap" - SO that if you have read element failure on some sectors, the drive can be remapped to read properly. If it finds errors, it will fix them
Next, you exit out of ViVard to the main Hiren's Menu, and you will see "go back to the main menu" - Do that, and trhen choose "Mini XP"
And it will boot to a low-ram footprint of that OS. You may not need to hit "find all drivers" and "install network" - You can if you need to. These links are on the desktop
What we need to do, is run a short CHKDSK - There is a link in the Program Menu, "Scan Disks" - Click that, a dos window pops up, from there choose your main Boot drive, usually drive C, but sometimes this will be D, if you have a recover partition.
If this short Scandisk finds errors and fixes them, you may be good to go, but I always do a FULL CHKDSK after that, open a command windows or a Dos Box, and type "chkdsk c: /x /r"
And it will run a full scan. When this is done, restart and take the Boot Disk out, and let it try to boot regular, if you are asked, just choose "boot to Windows 8" and it will finish it's Auto Repair - DO NOT interrupt it, it will mess up your drive if you do.
The system should then finalize all repairs, and then finish booting. It will reboot several times, just let it finish, eventually tyou will see your Windows 8 User name and the circle.
If this does not fix it, we'll moce on from there.