Windows 8 Not Loading Up

I was playing Civilizations V on my computer when I wanted to load a savegame. While loading the savegame, Civilizations stopped responding, so I waited a little for the window to respond and come back to its normal state. After waiting for an unusually long time (about 2 or 3 minutes), I decided to whip up the task manager, but I couldn't do that either. After I realized my computer was completely frozen, I pressed the restart button on my computer.

Things went by as usual-the bootup screen and all that good stuff. After the loading screen (with the windows logo and the circling dots) went by normally, the screen blacked out as usual (to transition into the lock screen), but then it stayed like that. I thought there was some trivial, technical error, so I restarted again, but same thing, it was stuck after the loading screen.

The specifications of my gaming computer are:

Nvidia GeForce 9800 GPU
8GB RAM
3.7GHz Processor Speed

I can't exactly check all of the specs because I'm not able to login. If you can tell me how to access the specs from somewhere like the BIOS Screen or use command prompt to find this.

EDIT: I also forgot to mention that I've done Automatic Repair many times, and have done the chkdsk /f command in the command prompt, but I get a message saying that my disk is write-protected.