Man, I just had the biggest Nightmare of an install of windows 8.
Some things to try
-Format HDD (My main problem is, that Windows 8 did not want to install over my old windows I needed to format unfortunately)
-Make sure you have just your main HDD Connected, Disconnecting the rest.
(After installing, I would get stuck at Loading Windows Screen, because it would try to check my second HD for some reason, weird Quark, but Disconnecting It 1nce on boot fixed the problem)
-Try a new Iso Img for your OS Install
(Mabby the install is corrupt)
-Run UBCD [Latest Version]--google it easy to find
(This helps you Check your HD for bad sectors and such, does not have any functions for a SSD if you have that)
-Try Repair windows Via your install method (USB/CD w/e)
(If your using Windows 8, the repair options are just amazing, It's so nice.)