Macbook is not starting up, please help

Alright, as of 3 hours ago my Macbook (white model) is not loading up past the Grey screen with the Apple logo and the spinning circle. I have tried booting into safe mode by pressing "shift" key, and it won't work. I tried doing the hardware test by pressing the "D" key and it found no problems. I tried putting in my Mac OS X install Disc and it doesn't load it... It does find it though (when I pressed the option key).
The weird thing is, that I am currently on my Windows 7 OS..using my Macbook. This side of the harddrive seems to work just fine.
I have no idea why it is not working for me, I already reset the PRAM and SMC...
Can someone please help??
Does Apple give out replacement macbooks? or Will they be able to fix this??
I have had this macbook for 1 year as of October 2nd.

Did you try booting from your OS X install disc using the C key? When you used the option key, did the installer load?
If so, choose a language, then from the Installer menu, choose *Disk Utility*. Click on *Macintosh HD* in the left-hand column, then click *Repair disk*. If any errors can't be repaired, try again. If it fails a second time, post the message here.
~Lyssa

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