My computer won't boot up?

So, I was just typing a document on my laptop, and all of a sudden, whenever I tried to type something, it would act as if CTRL was being held down. (Type O, the computer tries to open something, type S, it saves the document." So, after pressing CTRL several times, and trying to find a different button I may have pressed, I turned off the computer. When I tried to reboot it, it took me to the login screen. When I tried to type the password, none of the keys would register, and when I tried to press backspace, that would register as a letter. I tried using the on-screen keyboard too, but that wouldn't show up as anything either. So, I restarted my computer again. This time, it said that Windows failed to start up, and that I should try System Repair. Because I wasn't sure if that would delete a bunch of important files, I chose to start Windows normally. This took me to the screen where it said "Starting Windows" and the Windows logo moved around, but it wouldn't move on from that screen, even after leaving it there for about 10 minutes. So, I restarted again. This time, I chose System Repair, which showed a loading bar, and eventually, a blank black screen with only my mouse on it. I've tried both options several times now, and these are the only results. I took out my battery, tried unplugging it, etc., but nothing is working.

Some things about the computer:

- I received it for Christmas

- It's a Toshiba Satellite with a Quad Core Processor and Windows 7

- I rarely turn it off, it's usually plugged in and idle, or just sitting there dead.

- I recently brought it to a party about 2 days ago, where it may have been stepped on or something, but it ran fine until late today, so I doubt that's the problem.

- I had alot of things open to do work today, so that may have contributed to the crash.

- I haven't backed anything up besides a portion of my iTunes.

Any solution would be appreciated, as I have about 200 GB worth of documents, music, software, etc. installed on there, and I would really be pissed off if I lost all of it! Thanks!