MacBook Pro :: Not Booting - Getting Infinite Spinning Wheel

I put in a samsung 500gb drive, and since yesterday this one is also doing strange. I was browsing the internet and it started launching itunes and going really slow although i wasn't doing anything, then it showed a force quit window telling me there was not enough memory on the startup disk for applications, althoug i still have roughly 340gb of free space. I just thought of restarting it maybe that solved the problem. But no, since then it doesn't startup in mac os x, bootcamp works fine with windows 7 installed. But starting snow leopard just gives me a grey screen like the safe boot screen with the progress bar and the spinning wheel. the progress bar dissapears after a while and the wheel etternaly spins.

Tried single user mode and fsck -fy but it only gives me some dislocations, it gets till the repairing Tree and then says that the volume Macintosh HD could not be repaired. Also tried to reset Pram but that neither. starting up with a bootable usb with the mac os x install dvd on it gives me the prohibitory sign after 2 minutes. I still have to try with my original disc, but that one is at home and I'm not gonna be there till next month.