Cannot boot my laptop, windows can't find any hardrive to boot OS..

Today when I was surfing on my laptop (G74S Series) I wanted to restart the laptop because the internet crashed and it usually helps to restart. But I restarted it holding down the power button thing.
So, I restarted it and while I was waiting, staring in to the screen, the blinking "_" thing when you start up was doing that for a while and nothing was happening, and a couple of seconds later the computer tells me that it can't boot the laptop/pc because no drive was found. I saw an error code but I didn't catch it, but it was something like "0x0000"
So then on later, it sent me in to "Image Restore" But I have no image to restore with, so I cancel it, and then it sends me into the menu where I can choose to "Restore Computer" or "Scan for startup errors" or something like that (I don't really have a such accurate memory.)
And on the top it also says "os unknown on (unknown) local disk"
Everytime I start the computer it sends me to that menu where I can choose to restore my computer etc..
And I can't really do much about it since I don't have the windows 7 disc/dvd thing either.
And this all came all so sudden I don't really know what to do.
I don't have any backu or anything, and windows can only detect my /D: drive and not /C:, and I have my OS on /C:

Is my hardrive corrupt or what happend?
And what should I do?
Any suggestions?
Hope I posted this on the right part of the forum..

Specs: Intel Core i7
GTX 560M
8GIG RAM
Windows 7 Home Premium x64